Technical tracker

1. 2 Oct 2026 · Preparation & specification

   Revised, trimmed front drum exit to increase brake-cooling capacity for high-demand circuits.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification (phase date)

   Komatsu said different parts were not necessarily behaving identically and Bearman was less happy in FP2 than FP1, a change conditions did not explain. The part was not named.

   Team statement · component undisclosed · Resolution unconfirmed

   Formula1.com · Friday team quotes ↗
2. 3 Oct 2026 · Preparation & specification

   Bearman reported an unusual outside-front lock-up into Turn 1 on his second qualifying run and said the brakes needed investigating — a driver suspicion, not a diagnosis. He qualified 18th.

   Driver-reported symptom · diagnosis undisclosed · Resolution unconfirmed

   Formula1.com · qualifying quotes ↗

1. 2 Oct 2026 · Preparation & specification

   Bortoleto stopped late in FP2 with an apparent gearbox issue; he said it cost no running time.

   Reported symptom · component undisclosed · Resolution unconfirmed

   Formula1.com · Friday team quotes ↗
2. 4 Oct 2026 · Weekend faults & behaviour

   Document 46 lists a replacement gearbox assembly including control hydraulics, both rear suspension assemblies and associated gearbox parameters on car 5. The documents do not name the failed internal part or link it to FP2.

   Primary document · exact replaced components · Resolution unconfirmed

   FIA · Document 46 ↗
3. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   A week later Bortoleto retired early from the Singapore Grand Prix with a suspected gearbox failure. A recurrence of a gearbox symptom on the same car; no link between the two events has been established.

   Recurrence · link not established · Resolution unconfirmed

   Audi F1 · Singapore Sunday ↗

1. 2 Oct 2026 · Preparation & specification

   New ICE and turbocharger, the 4th of each — within the allowance. No reason given.

   Primary document · allocation count · Not an issue

   FIA · Document 14 ↗

1. 2 Oct 2026 · Preparation & specification

   5th ICE (4 allowed): 10-place drop on top of a five-place penalty from Baku. Alpine said it took the penalty where overtaking offered a way back.

   Primary document · allocation count · Not an issue

   FIA · Documents 14 and 18 ↗

1. 2 Oct 2026 · Preparation & specification

   Local development of the outboard winglet cascade for downforce across the operating envelope; not Sepang-specific.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Updated rear impact structure geometry with an additional device available for circuit-specific tuning.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Hadjar started the event with his 7th ICE of a 4-unit allowance, earning a five-place grid drop (P3 → P8). The reason for the change is not given.

   Primary document · exact declared component · Resolution unconfirmed

   FIA · Documents 14 and 17 ↗
2. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   At the next race Hadjar suffered a Sprint PU failure and further PU symptoms at the GP start (see the Singapore Hadjar PU record). The repeated replacements are not explained by any disclosed root cause.

   Recurrence · root cause undisclosed · Resolution unconfirmed

   Formula1.com · Hadjar / Mekies ↗

1. 2 Oct 2026 · Preparation & specification

   5th ICE, 5th turbocharger and 5th exhaust set (4 allowed each) plus a 6th PU ancillary (within 6): 30-place penalty. Alan Permane said the change was timed for a circuit with overtaking and high degradation.

   Primary document · allocation count · Not an issue

   FIA · Documents 14 and 19 ↗

1. 2 Oct 2026 · Preparation & specification

   New high-cooling engine-cover bodywork to increase cooling mass flow for Sepang and the hot races that follow.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Reprofiled horizontal elements and an added vertical slotted upper element to improve local pressure distribution and flow to the rear.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Re-optimised diffuser roof and sidewall to increase load and robustness across the operating envelope.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Additional slots and reprofiled elements to increase local load and improve flow into the diffuser.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Reprofiled elements plus additional down-washing elements to increase local load and outwash and raise rear floor load.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification (phase date)

   Both cars ran the seven-part package. Shovlin reported a difficult balance and tyre overheating on Friday; both drivers spoiled their FP2 soft laps at the last corner.

   Team statement · set-up changes undisclosed · Monitoring

   Formula1.com · Friday team quotes ↗
2. 6 Oct 2026 · Assessment & development

   Lord said a possible interaction between the update, track temperature and surface left drivers turning the car on the throttle in slow corners, worsening tyre temperatures; the package appeared effective in faster corners, but causes still had to be separated.

   Team diagnosis · provisional · Monitoring

   Autosport · Bradley Lord ↗
3. 9 Oct 2026 · Preparation & specification (phase date)

   At the next race Mercedes split specifications: Russell reverted to the Azerbaijan aero specification while Antonelli kept the upgraded car and tested a new front wing. This is a comparison exercise, not a verdict on the package.

   Team action · evaluation ongoing · Monitoring

   Formula1.com · Wolff ↗

1. 2 Oct 2026 · Preparation & specification

   Reduced volume and a steeper side-view ramp to increase downwash to the rear floor and rear drum.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Rear drum winglet chord and position re-optimised for rear tyre wake control alongside the new suspension fairings.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Track-rod and driveshaft fairing camber redistributed to increase load and couple with the diffuser winglet and rear drum furniture.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Longer-chord flap for the Baku front wing, adding front load to meet Sepang's balance requirements.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   Improved auxiliary and support components to make the rear wing's load more efficient.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification

   New floor board geometry to extract more local load while keeping the flow behind the front tyres stable.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 2 Oct 2026 · Preparation & specification (phase date)

   Albon complained about deployment and rear stability on Friday, and said low-speed improvements made before FP2 cost medium- and high-speed performance (reporter paraphrase).

   Driver statement · paraphrase · Resolution unconfirmed

   Formula1.com · Friday team quotes ↗

1. 3 Oct 2026 · Preparation & specification

   New ICE for the remainder of the event, his 4th of 4 — no penalty. No reason given.

   Primary document · allocation count · Not an issue

   FIA · Document 30 ↗

1. 3 Oct 2026 · Preparation & specification

   Two qualifying warnings for exceeding the Safety Car-line timing; the team said its PU configuration required a particular out-lap procedure. A regulatory matter, not a failure.

   Primary document · team explanation · Not an issue

   FIA · Documents 40 and 41 ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   Albon reported brake issues and a flat-spotted soft tyre before his gearbox retirement. No link between the brake and gearbox problems is established.

   Driver report · subsystem cause unknown · Resolution unconfirmed

   Formula1.com · race-day quotes ↗
2. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   In Singapore Albon reported persistent brake overheating alongside a fuel issue (see Singapore records). The Sepang brake issue therefore cannot be treated as resolved.

   Recurrence of brake symptom · cause unknown · Resolution unconfirmed

   Williams · Albon, Singapore report ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   A gearbox problem stopped Albon on track, bringing out the VSC on the leader's lap 43, upgraded to a Safety Car when the car proved hard to recover. The failed part is not disclosed.

   Team statement · failure mode undisclosed · Resolution unconfirmed

   Formula1.com · race-day quotes ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   Bortoleto said he was limited to about 30 km/h during the aborted formation procedure and returned to the pits rather than power-cycling the car.

   Driver-reported symptom · Resolution unconfirmed

   Pit Debrief · Bortoleto ↗
2. 8 Oct 2026 · Assessment & development

   FIA review: some cars running low engine RPM in sectors with a 250 kW wet-weather power reduction lost more power than intended and could not recover it in those sectors. Updated PU software was issued within five minutes of the suspension; the Sepang configuration will be reinstated in similar conditions and a further wet-weather update is due for the United States GP.

   Primary statement · cause identified, further update pending · Monitoring

   FIA · formation-lap software review ↗

1. 4 Oct 2026 · Weekend faults & behaviour

   The Technical Delegate's parc fermé report lists a new low-pressure fuel pump on car 44, approved under B3.5.4. No reason is given and no source links it to the formation-lap power loss.

   Primary document · exact replaced component, reason undisclosed · Resolution unconfirmed

   FIA · Document 46 ↗
2. 1 Nov 2026 · Assessment & development

   Mexico (1 Nov): Doc 66 again records a low-pressure fuel pump change on Hamilton's car in parc fermé before the race. Ferrari gave no reason.

   FIA-documented part change · repeat · Resolution unconfirmed

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   Hamilton reported “I’m pressing the throttle and nothing’s happening!” and stopped on the start/finish straight during the suspended procedure; he started the race and finished third.

   Driver radio quote · Resolution unconfirmed

   Formula1.com · race report (radio quote) ↗
2. 8 Oct 2026 · Assessment & development

   FIA review: some cars running low engine RPM in sectors with a 250 kW wet-weather power reduction lost more power than intended and could not recover it in those sectors. Updated PU software was issued within five minutes of the suspension; the Sepang configuration will be reinstated in similar conditions and a further wet-weather update is due for the United States GP.

   Primary statement · cause identified, further update pending · Monitoring

   FIA · formation-lap software review ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   Hülkenberg said there was nothing he could do in the cockpit until a software intervention was made during the red flag.

   Driver-reported symptom · Resolution unconfirmed

   Pit Debrief · Hülkenberg ↗
2. 8 Oct 2026 · Assessment & development

   FIA review: some cars running low engine RPM in sectors with a 250 kW wet-weather power reduction lost more power than intended and could not recover it in those sectors. Updated PU software was issued within five minutes of the suspension; the Sepang configuration will be reinstated in similar conditions and a further wet-weather update is due for the United States GP.

   Primary statement · cause identified, further update pending · Monitoring

   FIA · formation-lap software review ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   Running third, Russell stopped on the main straight on lap 50 behind the Safety Car; Lord described an unusual engine sound followed by sensors misbehaving.

   Team statement · component undisclosed · Resolution unconfirmed

   Motorsport.com · Bradley Lord ↗
2. 6 Oct 2026 · Assessment & development

   After a first inspection Lord called it “clearly a mechanical failure on the PU side”, with the root cause still to be determined. Russell lacked low-mileage units, so an earlier new engine — possibly with a penalty — was under consideration.

   Team statement · root cause undisclosed · Resolution unconfirmed

   Autosport · Bradley Lord ↗

1. 4 Oct 2026 · Weekend faults & behaviour (phase date)

   Verstappen radioed “I can’t accelerate! It’s not working, guys” on the aborted formation lap. He started the race normally after the red flag and won.

   Driver radio quote · Resolution unconfirmed

   Formula1.com · race report (radio quote) ↗
2. 8 Oct 2026 · Assessment & development

   FIA review: some cars running low engine RPM in sectors with a 250 kW wet-weather power reduction lost more power than intended and could not recover it in those sectors. Updated PU software was issued within five minutes of the suspension; the Sepang configuration will be reinstated in similar conditions and a further wet-weather update is due for the United States GP.

   Primary statement · cause identified, further update pending · Monitoring

   FIA · formation-lap software review ↗

1. 5 Oct 2026 · Assessment & development (phase date)

   Piastri said the new parts performed as expected but rivals had also improved; the team called itself the fourth-fastest and planned a review before Singapore.

   Team statement · performance assessment · Not an issue

   McLaren · race report ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   Cooling changes introduced at Azerbaijan reportedly reduced brake temperatures by around 100°C, but this is a driver assessment, not a controlled instrumented comparison. Singapore still exposed the limitation.

   Driver-reported improvement · no validated closure · Monitoring

   Motorsport.com · Bottas ↗
2. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Bottas reported increasing lift-and-coast from lap 2; temperatures initially stabilised and then rose again. Disc, caliper, duct and brake-by-wire causes are not identified.

   Driver report · subsystem cause unknown · Monitoring

   Motorsport.com · Bottas ↗
3. 12 Oct 2026 · Assessment & development (phase date)

   Bottas described the issue as almost solved and expected a different design next year. Almost solved is not validated closure.

   Driver assessment · no confirmed cure · Monitoring

   Formula1.com · Bottas ↗
4. 23 Oct 2026 · Weekend faults & behaviour

   At Austin, Bottas described “a productive Friday for us here in COTA with no issues” while testing front wings and set-ups. No brake-cooling statement was made, so this is not a confirmation that the Singapore limitation is solved.

   Driver statement · no specific brake follow-up · Monitoring

   Formula1.com · Friday team debrief (U.S. GP) ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   Reported gearbox-related interruption in practice. A shared component defect with Bortoleto is not established.

   Reported subsystem · common cause not established · Resolution unconfirmed

   Grande Prêmio ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   New front brake duct increases cooling mass flow for Marina Bay and upcoming circuits. Individual-car fitment is not established.

   FIA declaration · cooling range · Not an issue

   FIA Car Presentation Document 9 ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   Endplate and footplate adapted to the new wing; dive-plane camber adjusted to support loading and flow around the front tyre.

   FIA declaration · flow conditioning · Not an issue

   FIA Car Presentation Document 9 ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   Chord distribution changed between three wing elements, with a two-element straight mode, to improve loading and front-tyre wake control. The team split specifications across its cars; individual allocation is not disclosed here.

   FIA declaration · flow conditioning · Not an issue

   FIA Car Presentation Document 9 ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   Larger exits increase rear-brake cooling capacity at a high-braking-demand circuit.

   FIA declaration · cooling range · Not an issue

   FIA Car Presentation Document 9 ↗

1. 9 Oct 2026 · Preparation & specification (phase date)

   A previous front-wing assembly was modified to increase local front-wing load for street-circuit balance.

   FIA declaration · balance range · Not an issue

   FIA Car Presentation Document 9 ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Closing on other cars raised brake temperatures and forced him to back off. The team retired the car early to protect it after more than 50 laps of fuel/brake management.

   Driver report · brake root cause undisclosed · Resolution unconfirmed

   Williams · Albon ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Albon identified a fuel issue managed through the race. The affected fuel-system component and mechanism are undisclosed. Brake overheating was a separate reported limitation.

   Driver report · component undisclosed · Resolution unconfirmed

   Williams · Albon ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Reported electrical-energy deployment and driveability complaints; these do not confirm an energy-store, MGU-K or control-electronics hardware failure. Honda said the removed turbo was not broken.

   Driver symptoms · turbo failure not established · Resolution unconfirmed

   PlanetF1 · reported team radio ↗
2. 12 Oct 2026 · Assessment & development (phase date)

   Honda committed to investigating power-delivery behaviour before Austin; the causal link with turbo replacement remains unresolved.

   Team follow-up · no validated fix · Resolution unconfirmed

   RacingNews365 · Honda ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Brake management is documented as an operating constraint, not a confirmed component failure.

   Operational assessment · not a diagnosed fault · Not an issue

   BBC Sport ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Stopped early in the GP and triggered the first VSC. Audi described a suspected gearbox issue; gearset, hydraulics, selector and software are not identified as the failed part.

   Suspected diagnosis · not confirmed · Resolution unconfirmed

   Audi F1 ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   GP retirement reported as a suspected driveline issue. No gearbox, driveshaft or differential failure is identified; recurrence of the Sprint electrical problem is not established.

   Suspected diagnosis · distinct from Sprint electrical issue · Resolution unconfirmed

   Drivers’ Section ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Lap-4 Sprint retirement reported as a suspected energy-store fault with power loss/shutdown. Replacement from the component pool does not establish the internal failure mechanism or a validated cure.

   Suspected subsystem · replacement not proof of resolution · Resolution unconfirmed

   Drivers’ Section ↗
2. 23 Oct 2026 · Preparation & specification

   FIA Documents 13 and 14 record a fourth control electronics unit (PU-CE) for Colapinto at Austin, over the allocation and carrying a ten-place grid drop. No source links this change to the Singapore Sprint shutdown; the cause of that shutdown remains undisclosed.

   FIA-documented element usage · no diagnosis linking the two · Resolution unconfirmed

   FIA · Stewards decision, Document 14 (U.S. GP) ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Poor power delivery off the line and heavy rear-tyre consumption were reported. No common controls or mechanical defect is established.

   Reported symptoms · root cause unconfirmed · Resolution unconfirmed

   Drivers’ Section ↗
2. 1 Nov 2026 · Assessment & development

   Mexico race (1 Nov): Gasly said he launched well but lost power on the straight, and again at the restarts. Alpine gave no cause.

   Driver-reported · similar symptom at a later race · Resolution unconfirmed

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Lost fourth gear in qualifying and could not complete a flying lap. Extinguishant used on the parked car does not establish a fire mechanism or a specific actuator failure.

   Reported functional failure · no component-level diagnosis · Resolution unconfirmed

   Formula1.com · Hadjar / Mekies ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Engine/PU trouble limited the final Sprint Qualifying run; a lap-3 Sprint PU failure led to previously used PU elements being fitted for GP qualifying. Neither the failed internal component nor failure mechanism is public.

   Team and driver account · diagnosis undisclosed · Resolution unconfirmed

   Formula1.com · Hadjar / Mekies ↗
2. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Further PU issues at the GP start cost position to Alonso. Recovery to P10 does not demonstrate the reliability chain was resolved.

   Race symptom · diagnosis undisclosed · Resolution unconfirmed

   Formula1.com · Hadjar / Mekies ↗
3. 12 Oct 2026 · Assessment & development (phase date)

   Mekies acknowledged the team owed Hadjar a clean weekend. No root cause, validated corrective action or durability result was disclosed.

   Team acknowledgement · corrective action undisclosed · Resolution unconfirmed

   Formula1.com · Mekies ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Battery issues in the opening laps cost two positions after reaching P10. Cell damage, cooling, inverter and deployment software are not confirmed causes.

   Driver-attributed battery symptom · Resolution unconfirmed

   Williams · Sainz ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Retired with an overheating clutch, triggering a VSC. Friction material, actuation, cooling and operating demand are not isolated as causes. Sources disagree on the retirement lap.

   Named subsystem · root cause unconfirmed · Resolution unconfirmed

   Lance Stroll ↗

1. 11 Oct 2026 · Weekend faults & behaviour (phase date)

   Lost radio communication and relied on the pit board. Headset, transmitter, wiring and car electronics are not isolated as causes.

   Reported operational fault · hardware cause unknown · Resolution unconfirmed

   Formula1.com ↗

1. 12 Oct 2026 · Assessment & development (phase date)

   Alonso reported understeer the team could not rectify during the race. This is separate from energy deployment; no validated fix or quantitative diagnosis is public.

   Driver assessment · chassis symptom · Resolution unconfirmed

   PlanetF1 · Alonso ↗

1. 12 Oct 2026 · Assessment & development (phase date)

   Strong early pace was followed by increasing degradation. Thermal degradation, abrasion, pressures and balance migration are not isolated as causes; no specific hardware fix is announced.

   Driver assessment · no quantitative diagnosis · Not an issue

   Formula1.com · Leclerc ↗

1. 12 Oct 2026 · Assessment & development (phase date)

   No specific reliability fault was disclosed in the Singapore snapshot; race pace remains a separate development question.

   Performance assessment · not proof of fault-free hardware · Not an issue

   Haas F1 Team ↗

1. 12 Oct 2026 · Assessment & development (phase date)

   Race execution and tyre utilisation are assessed separately from reliability; a result is not evidence of a hardware repair.

   Performance assessment · no hardware fix established · Not an issue

   The Paddock ↗

1. 23 Oct 2026 · Preparation & specification

   Rear floor corner redesigned to improve interaction with the rear corner flowfield and increase local load.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Second and third rear-wing flap elements redesigned to improve flow quality and overall load.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Document 14 confirms use of a fourth PU-CE and a ten-position drop for the next race in which Colapinto participates. Nielsen said this drove a race-focused Friday programme, with little qualifying simulation work on Colapinto’s side.

   FIA stewards’ decision; programme explanation team-confirmed · Not an issue

   FIA · stewards, document 14 ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Gasly said COTA’s bumps made it difficult to get a clear read on balance, with set-up work targeting ride quality. High-fuel pace was stronger than low-fuel performance; this is a handling report, not a disclosed suspension or hydraulic fault.

   Driver-reported symptom; team-confirmed performance limitation · Resolution unconfirmed

   Formula1.com · Friday team debrief ↗
2. 25 Oct 2026 · Assessment & development

   Gasly finished tenth after early contact from Bearman. No race-day statement on ride over the bumps was located.

   Race result only · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Pedro de la Rosa said both cars completed the full Friday programme, with their lap times close together. He nevertheless identified further balance work; no specific reliability stoppage or component-level repair was established.

   Published team representative assessment · Monitoring

   Formula1.com · Published team/driver Friday statements ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Stroll reported that the car remained down on power on the straights, although corner performance looked better than Singapore. This is a driver comparison, not evidence of an identified PU component failure. Quote: “I think we're looking a little better here than we did in Singapore, although we're still down on power on the straights.”

   Driver-reported symptom · cause not disclosed · Resolution unconfirmed

   Formula1.com · Published team/driver Friday statements ↗
2. 25 Oct 2026 · Assessment & development

   Aston Martin replaced Stroll’s power unit and battery before the race (pit-lane start). It did not link the change to a diagnosis, and Newey said the team still lacked straight-line speed.

   Team-confirmed replacement · no diagnosis · Resolution unconfirmed

   Aston Martin F1 · United States GP race reaction ↗

1. 23 Oct 2026 · Preparation & specification

   Updated floor-board geometry to improve local flow conditioning and support overall floor performance.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Revised front brake duct with updated cooling characteristics and associated aerodynamic performance, complementing recent development steps.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   New mirror-stay geometry complementing the revised front corner and the recently introduced package.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Document 13 lists fourth ICE, turbocharger, exhaust set, energy store and control electronics, plus sixth ancillary component. Only the energy store and control electronics exceed the respective three-element allocations; no component-failure cause is established by that usage document.

   FIA-documented hardware and allocation compliance · Not an issue

   FIA · Document 13, New PU Elements ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   The Formula1.com Friday narrative says Hülkenberg parked early near the end of FP1 with a PU issue. The same article quotes him describing Friday as straightforward without issues; no exact failed component, duration, red flag or explicit repair confirmation was established, so the discrepancy remains unresolved. Quote: “Today was a pretty straightforward Friday without any issues. We tried a few things across FP1 and FP2 and learnt a bit along the way.”

   Outlet-reported stoppage; conflicting driver statement · Resolution unconfirmed

   Formula1.com · Published team/driver Friday statements ↗
2. 25 Oct 2026 · Assessment & development

   Audi’s event page describes Friday as “trouble-free” and does not mention a PU fault; Hülkenberg’s race-start anti-stall is recorded separately.

   Team summary · no reconciliation · Resolution unconfirmed

   Audi F1 · United States GP event page ↗

1. 23 Oct 2026 · Preparation & specification

   Revised forward floor fences improve flow conditioning to the rear and reduce sensitivity to car attitude while keeping overall load.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Sidepod top-deck louvres updated to increase power-unit cooling capacity with minimal aerodynamic cost.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Bottas described a smooth Friday testing different front wings and set-ups, while acknowledging a gap to the opposition. He recorded 21 FP1 laps and 24 FP2 laps; no reliability diagnosis was reported in that debrief. Quote: “A productive Friday for us here in COTA with no issues.”

   Driver-confirmed issue-free Friday; performance deficit · Not an issue

   Formula1.com · Friday team debrief ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   After Herta drove his car in FP1, Pérez completed 24 FP2 laps and said one experimental parts/set-up change put him on the back foot for the rest of the session. Formula1.com noted a late departure while the team finalised the car set-up, but no failed component or quantified mechanical running loss was disclosed.

   Driver-reported experimental setback; cause/component not disclosed · Resolution unconfirmed

   Cadillac · official practice report ↗
2. 25 Oct 2026 · Assessment & development

   Pérez finished 19th, a lap down; no Cadillac statement on the FP2 experiment was located.

   Race result only · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 23 Oct 2026 · Preparation & specification

   Using the improved onset flow, diffuser volume, expansion profile, fence loading and trailing-edge outboard furniture optimised to return more load efficiently.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Declared jointly with the floor body: reshaped inboard vertical and top horizontal board elements, same stated aim of more floor downforce and rearward flow stability.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Declared jointly with the floor board: updated board brace layout and redesigned front floor leading edge, to increase front and rear floor downforce and send more energetic, stable flow rearwards.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 22 Oct 2026 · Preparation & specification

   Hamilton: "We have a very, very small upgrade this weekend. It's less than a tenth. It's like half a tenth." He did not expect it to close the gap on its own.

   Driver quote · expected gain, not measured · Monitoring

   Crash.net · Thursday press conference ↗
2. 22 Oct 2026 · Preparation & specification

   Leclerc called the package a "small step in the right direction" but did not "expect anything hugely significant".

   Driver quote · expected gain, not measured · Monitoring

   SB Nation · Thursday media session ↗
3. 23 Oct 2026 · Preparation & specification

   Ferrari declared four parts (floor body, floor board, sidepod inlet / coke, diffuser), all "Performance – local load and flow conditioning". Reported as the team's last major package of 2026.

   FIA declared upgrade · reported as final 2026 package · Monitoring

   FIA Car Presentation Document 11 · Crash.net ↗
4. 23 Oct 2026 · Weekend faults & behaviour

   Leclerc led both Friday sessions and said the upgrades worked as expected. He warned rivals had more potential to unlock; this was a driver assessment, not proof of a quantified aerodynamic gain. Leclerc: “Our upgrades worked as expected, but we must not get carried away by too high expectations ahead of tomorrow, as I believe our competitors have more potential to unlock.”

   Driver assessment of FIA-declared upgrade · Monitoring

   Formula1.com · Published team/driver Friday statements ↗

1. 23 Oct 2026 · Preparation & specification

   Additional lower sidepod-inlet volume with reshaped undercut and coke-line volumes, part of the same floor-downforce and flow-stability step.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Hamilton said his alternative Friday set-up direction left him uncomfortable, especially over the bumps. He subsequently topped FP3 and qualified fifth, but no explicit statement that this particular concern was fixed was verified. Quote: “We tried a different direction with the set-up, but I wasn’t comfortable in the car, especially over the bumps.”

   Driver-reported symptom · cause not disclosed · Resolution unconfirmed

   Formula1.com · Published team/driver Friday statements ↗
2. 25 Oct 2026 · Assessment & development

   Hamilton two-stopped to fourth. No race-day statement on his comfort over the bumps was located.

   Race result only · no follow-up statement · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Bearman reported a good feeling continuing from Singapore, finishing FP2 tenth; Komatsu called it probably his cleanest Friday of the season. Haas reported 103 Friday laps across the two cars, 51 for Bearman and 52 for Ocon; no specific reliability stoppage was identified.

   Driver/team assessment; team mileage report · Not an issue

   Pitpass · Haas practice team notes ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Ocon reported front locking and difficulty attacking corners on the bumpy circuit, noting changes to parts relative to Singapore without identifying them. Komatsu confirmed braking difficulty needing investigation; neither diagnosed brake-by-wire, hydraulics or a specific hardware failure. Quote: “Conditions are good out there, but the track is quite bumpy all the way around. We’ve struggled since the start of the day, front-locking everywhere, and the car’s very difficult when trying to attack the corners.”

   Driver-reported symptom; team-confirmed difficulty, cause undisclosed · Resolution unconfirmed

   Formula1.com · Friday team debrief ↗
2. 25 Oct 2026 · Assessment & development

   Ocon finished 14th, a lap down. No race-day statement on front locking was located.

   Race result only · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 23 Oct 2026 · Preparation & specification

   Diffuser geometry modified to improve flow conditioning and local load across the speed range.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Front corner scoop and furniture revised together with the front suspension fairings to improve flow conditioning.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Rear corner furniture revised to improve flow conditioning and increase local load.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Rob Marshall said the minor updates appeared to deliver expected performance, with positive long runs despite failing to maximise FP2. FIA document 11 specifies revised front-corner furniture, rear-corner furniture and diffuser geometry; Piastri reported grip as his main limitation.

   Team technical assessment plus FIA-documented hardware · Monitoring

   Formula1.com · Published team/driver Friday statements ↗

1. 23 Oct 2026 · Preparation & specification

   FIA document 13 records Piastri taking his fifth PU ancillary component, within the six permitted. The document does not diagnose a fault requiring the change.

   FIA-documented element usage · Not an issue

   FIA · Document 13, New PU Elements ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Antonelli returned to the garage in FP2 to adjust a seat moving in the cockpit. The Race reported the radio description verbatim; the duration of lost running and an explicit later repair confirmation were not established. Quote: “moving like crazy”

   Driver-reported symptom · cause not disclosed · Resolution unconfirmed

   The Race · FP2 report ↗
2. 25 Oct 2026 · Assessment & development

   Mercedes’ race report does not mention the seat; the earlier media report of a garage fix remains unconfirmed by the team.

   No team follow-up · Resolution unconfirmed

   Mercedes-AMG F1 · Race report ↗

1. 23 Oct 2026 · Preparation & specification

   FIA document 13 lists Antonelli’s sixth PU ancillary component, within the six-element allocation. Document 11 lists no new Mercedes updates for this event; Friday assessment concerned continuing understanding of its existing package.

   FIA-documented element usage · Not an issue

   FIA · Document 13, New PU Elements ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Andrew Shovlin said locking compromised both single-lap and long-run work in FP1. Repositioning the cars for FP2 reduced balance problems and made them more predictable, but the team still sought a wider consistent operating window.

   Team-confirmed handling limitation; no brake hardware fault disclosed · Monitoring

   Formula1.com · Published team/driver Friday statements ↗
2. 25 Oct 2026 · Assessment & development

   Antonelli won with a car he said “felt great”, but Russell lacked balance and Shovlin said the set-up window has become harder to hit since the update.

   Team assessment · mixed between cars · Monitoring

   Mercedes-AMG F1 · Race report ↗

1. 23 Oct 2026 · Preparation & specification

   FIA Document 13 records Lindblad starting the event with his sixth ICE of a four-engine allowance. Alan Permane confirmed the resulting five-place grid drop on Friday; after qualifying ninth he is set to start 14th. The reason for the change was not disclosed.

   FIA-documented hardware; penalty team-confirmed · Not an issue

   FIA · Technical Delegate report, document 13 ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Permane reported that the new floor, bodywork and both wings were working as expected, consistent with document 11. Lawson felt the car was quick but degradation exceeded expectations; Lindblad struggled for soft-tyre rhythm and wanted better long-run performance.

   Team-confirmed upgrade assessment; driver-reported tyre behaviour · Monitoring

   Formula1.com · Friday team debrief ↗
2. 25 Oct 2026 · Assessment & development

   Lawson finished ninth and Lindblad twelfth. No race-day statement on whether tyre degradation improved was located.

   Race result only · Monitoring

   Formula1.com · Race report (25 Oct) ↗

1. 23 Oct 2026 · Preparation & specification

   Reprofiled shoulder and undercut working with the floor updates to manage flow along the side of the car towards the rear.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Multiple floor changes (leading-edge devices, board, floor edge) improving flow management around the floor for an efficient downforce increase.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   New endplate to further improve management of the flow around the front tyres and downstream.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Rear-wing flap camber and chord modified to clean up local flow and generate more load.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   Reliability update: gaiter periphery revised to reduce strain where it deflects most at steering lock, lowering the risk of the elastomeric material tearing. No prior tearing incident is stated in the document.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Preparation & specification

   On the recently introduced front wing, an optional tyre-temperature turning vane added for evaluation: gives a tyre surface temperature measurement and more local load with similar flow stability.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 11 ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Hadjar said Friday set-up changes left the soft-tyre balance worse, with front grip falling away after Sector 1. He qualified third, but that result alone does not establish that the tyre-temperature problem was fixed. Quote: “There are things to improve and work on overnight, particularly with the car balance, which should help.”

   Driver-reported symptom · cause not disclosed · Resolution unconfirmed

   Formula1.com · Published team/driver Friday statements ↗
2. 25 Oct 2026 · Assessment & development

   Hadjar ran soft tyres to lap 25 and said he was “extremely comfortable on the softs, pushing them”; he did not say the overheating problem had been fixed.

   Driver-reported improvement · no explicit fix · Monitoring

   Formula1.com · How everything went wrong for Red Bull (25 Oct) ↗

1. 23 Oct 2026 · Weekend faults & behaviour

   Technical director Pierre Waché said Verstappen’s car had a steering issue in FP1 and that the team managed to resolve it, with set-up improvements following in FP2. The failed steering component and the running lost were not disclosed. Quote: “We had a steering issue on Max’s car in FP1, which we managed to resolve, and we saw some improvements with the set-up in FP2.”

   Team-confirmed fault and fix · component not disclosed · Solved

   Waché said the FP1 steering issue was resolved (Friday team debrief).

   Formula1.com · Friday team debrief ↗

Resolution: Waché said the FP1 steering issue was resolved (Friday team debrief).

1. 23 Oct 2026 · Weekend faults & behaviour

   Sainz and chief engineer Paul Williams identified medium/high-speed corners, particularly sector one, as a weakness; Albon used FP1 for aero data gathering and had a flying lap deleted. Formula1.com separately reported Sainz describing the car on radio as a “mess” and saying he had “no confidence”; these are published fragments, not a complete radio transcript.

   Driver and team assessment; published radio fragments, root cause undisclosed · Resolution unconfirmed

   Formula1.com · Friday team debrief ↗
2. 25 Oct 2026 · Assessment & development

   Albon and Sainz finished 17th and 18th, a lap down. No Williams statement reassessed the medium/high-speed weakness.

   Race result only · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 23 Oct 2026 · Preparation & specification

   Sainz received a new PU-ANC after four previously used, making this his fifth. Document 11 declares no Williams upgrades for this event; no gearbox or parc fermé change for either Williams was identified in the available decision set.

   FIA-documented PU allocation; limited negative document search · Not an issue

   FIA · Technical Delegate report, document 13 ↗

1. 24 Oct 2026 · Weekend faults & behaviour

   FIA document 35 records fifth ICE, turbocharger, exhaust set, energy store and control electronics, fourth MGU-K and seventh ancillary component used in FP3. Stewards imposed a 60-place grid drop for those additional changes; this is a separate Saturday ruling and does not identify the reason for replacement.

   FIA steward decision · Not an issue

   FIA · Stewards decision, Document 35 ↗

1. 24 Oct 2026 · Assessment & development

   Norris said after qualifying that the car had pace for P2 but was extremely difficult to drive. He blamed his own execution; his final Q3 lap was deleted at Turn 19, dropping him from a provisional sixth to eighth. Quote: “Probably the hardest car I've ever had to drive in my life. But good enough for P2, so I should be P2 and I'm P8, so clearly, I did a very bad job today.”

   Driver-reported symptom · cause not disclosed · Open

   Motorsport.com · Norris after qualifying ↗
2. 25 Oct 2026 · Assessment & development

   Norris finished fifth on a one-stop and said “qualifying performance and car predictability remain our main priorities to address”.

   Driver post-race statement · Open

   McLaren · Race report (25 Oct) ↗
3. 30 Oct 2026 · Assessment & development

   Mexico FP2: Norris said the car “is still proving a challenge to drive” and flat-spotted his mediums; after qualifying he again called it unpredictable.

   Driver-reported · persists at next race · Open

   Formula1.com · What the teams said, Friday (31 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Colapinto said contact with Lindblad damaged the right side of the car, costing about 1.5 s a lap, and led to his retirement; he is classified after 35 laps.

   Driver-attributed damage · component not named · Open

   OneFootball / Radio Gol · Colapinto after Austin DNF (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Colapinto started on hards, was stuck behind Sainz and reported repeated lock-ups “in every braking zone” and tyre overheating in dirty air. This is a driver account, not a brake-system fault.

   Driver-reported symptom (media relay) · Open

   OneFootball / Radio Gol · Colapinto after Austin DNF (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Bearman hit Gasly early in the race. Gasly finished tenth for one point; no Alpine damage report was found.

   Published race observation · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Aston Martin confirmed damage from lap-1 contact with Albon. A front-wing change on lap 42 (40.4 s in the pit lane) ended the planned one-stop. Quote: “We carried on, but eventually had to pit for a new front wing and that dropped us down the order.”

   Team-confirmed damage · component disclosed · Resolution unconfirmed

   Aston Martin F1 · United States GP race reaction ↗

1. 25 Oct 2026 · Assessment & development

   Newey said Alonso’s pace matched the cars ahead before his stop, but a straight-line speed deficit made overtaking impossible. Quote: “Before the pit stop, Fernando's pace was on a par with the cars ahead of him but we couldn't match their straight-line speed which meant there was no option to overtake.”

   Team technical assessment · Open

   Aston Martin F1 · United States GP race reaction ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Stroll started from the pit lane after PU and battery replacement and reached P15 despite losing rear downforce after his lap-41 stop. No failed part was named. Quote: “Lance – having started from the pit lane – progressed up to P15 at the flag despite losing downforce at the rear of the car after his second pit stop. We need to look at the data to understand exactly what happened.”

   Team-confirmed symptom · cause under investigation · Open

   Aston Martin F1 · United States GP race reaction ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   F1’s race report gives Bortoleto’s final sanction as 80 places after further PU elements; he started from the back row and finished 13th. No underlying failure was disclosed.

   Official sporting sanction · no diagnosis · Not an issue

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Audi said Hülkenberg had an anti-stall issue at the start and recovered from 15th to 11th. Why anti-stall activated was not disclosed. Quote: “After an anti-stall issue at the start, Nico Hulkenberg fought back from 15th to finish 11th, while Gabriel Bortoleto climbed from the back row to 13th.”

   Team-confirmed symptom · cause not disclosed · Resolution unconfirmed

   Audi F1 · United States GP event page ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Bottas slowed and pulled off after 48 laps, bringing the Virtual Safety Car out from lap 51 to 53. The cause was not disclosed.

   Published race observation · cause not disclosed · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗
2. 30 Oct 2026 · Assessment & development

   Mexico FP1: FIA documents a fifth ICE and turbo plus fourth ES, PU-CE and MGU-K on Bottas's car (50-place drop). Cadillac did not link the change to the Austin stop; cause still undisclosed.

   FIA-documented replacement · no diagnosis · Resolution unconfirmed

   FIA · Doc 17, Car 77 PU elements ↗

1. 25 Oct 2026 · Assessment & development

   Pérez finished 19th, a lap down. No post-race Cadillac statement on the FP2 experiment or the pace deficit was located.

   Race result only · Not an issue

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Leclerc two-stopped (soft–medium–hard) and passed Norris and then Verstappen late on. He locked up while fighting Norris; no damage or brake fault was reported.

   Published race observation · Not an issue

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Assessment & development

   Leclerc called the race positive on pace but said the first stint was harder and that Antonelli’s one-stop was “not really on our cards”. No Ferrari management technical statement was located (Ferrari’s site blocked access). Quote: “It was quite a good race, unfortunately came short of the victory which was our target. But it was a positive, we had good pace.”

   Driver post-race interview · Not an issue

   Motorsport.com · Race live text (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Bearman collided with Gasly (10-second penalty), reported strange handling and was told to let Ocon by. He pitted on lap 14 and retired with damage after 24 laps; the damaged component was not disclosed.

   Published symptom and retirement · no component diagnosis · Open

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   McLaren’s report lists Norris’s stop at 4.4 s against Piastri’s 2.1 s; OpenF1 shows a 25.7 s pit-lane time versus 23.4 s. No equipment fault was disclosed.

   Published stop time · cause not disclosed · Resolution unconfirmed

   McLaren · Race report (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Piastri said the car lacked pace and was hard to get into its window; the hard tyre let him convert to one stop and keep seventh ahead of Russell. Quote: “When you find the window on these cars, there is some pace but finding that window is very tricky.”

   Driver-reported limitation · Open

   McLaren · Race report (25 Oct) ↗
2. 31 Oct 2026 · Assessment & development

   Mexico Q2: Piastri said a new set of softs had “no grip” and the balance was completely different; eliminated 13th. Cause not established.

   Driver-reported · persists at next race · Open

   Formula1.com · Piastri on his Q2 exit (31 Oct) ↗

1. 25 Oct 2026 · Assessment & development

   Andrea Stella said the Austin upgrades helped and the car retains podium-fighting potential; Norris named qualifying and predictability as the priorities. Quote: “The team and the drivers worked very well, both in terms of strategic decisions and driving on the track, and the upgrades we brought here made a positive contribution”

   Team principal assessment · Not an issue

   McLaren · Race report (25 Oct) ↗

1. 25 Oct 2026 · Assessment & development

   Mercedes judged degradation low enough for a single medium-to-hard stop on lap 24 and called it a major turnaround from Friday’s uncompetitive running. Quote: “The car felt great today, and I was able to control the race, but it definitely wasn’t easy.”

   Team-confirmed strategy · driver assessment · Not an issue

   Mercedes-AMG F1 · Race report ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Mercedes said Russell struggled for balance on mediums and felt better after his stop, but stayed behind Piastri. He also served a 5-second penalty for leaving the track and gaining an advantage. Quote: “I just didn’t have the pace and I’m unsure why that is.”

   Team-confirmed handling difficulty · cause unknown · Open

   Mercedes-AMG F1 · Race report ↗
2. 31 Oct 2026 · Assessment & development

   Mexico: Russell said he is still struggling to get on top of the upgraded car — “the hit rate is too low” — despite qualifying P2.

   Driver-reported · persists at next race · Open

   FIA · Post-qualifying press conference (31 Oct) ↗

1. 25 Oct 2026 · Assessment & development

   Trackside engineering director Andrew Shovlin said pace was encouraging but the updated car has become harder to set up — consistent with the gap between Antonelli and Russell. Quote: “There were encouraging signs with the car pace, although since the update it does feel like the set-up window has become a little harder to hit.”

   Engineering assessment · Monitoring

   Mercedes-AMG F1 · Race report ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Colapinto blamed contact with Lindblad for damage to his Alpine; Lindblad started 14th after his engine penalty and finished 12th, with Lawson ninth. No Racing Bulls damage report was found.

   Opposing driver’s account · no team statement · Resolution unconfirmed

   OneFootball / Radio Gol · Colapinto after Austin DNF (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Hadjar blamed a poor launch from third on the grid on clutch overdelivery. No hardware failure was identified. Quote: “I had a clutch overdelivery so it was completely out of my control again.”

   Driver-reported fault · control behaviour · Open

   Formula1.com · How everything went wrong for Red Bull (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   After his lap-25 stop Hadjar said the car remained on the pit-stop throttle map, making it undriveable; he dropped from the podium fight to sixth. Quote: “I was blocked on a pit stop throttle map, it was just undriveable and that was it for me.”

   Driver-reported control/mapping fault · Open

   Formula1.com · How everything went wrong for Red Bull (25 Oct) ↗

1. 25 Oct 2026 · Assessment & development

   Hadjar extended his soft-tyre opening stint to lap 25 and said the car behaved well apart from electronics — a marked change from Friday’s front-overheating complaint, though not an explicit fix statement. Quote: “The car was behaving really well – apart from all the electronic downsides, I think everything was positive.”

   Driver post-race assessment · Not an issue

   Formula1.com · How everything went wrong for Red Bull (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Verstappen said the power unit behaved inconsistently, so the car's balance changed from corner to corner and lap to lap; he also cited weak high-speed performance. No failed component or diagnosis was disclosed. Quote: “From our side, I think there were too many issues with the power unit unfortunately in terms of consistency. You can’t rely on a consistent balance through a corner because if every lap and every corner it’s doing something different, it’s very hard to be on top of things.”

   Driver-reported symptom · cause not disclosed · Open

   Formula1.com · How everything went wrong for Red Bull (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   F1’s race report described an apparent deployment problem on the opening lap and suggested engine-braking trouble may have contributed to Leclerc’s late pass for second. Both were tentative observations, not a team diagnosis.

   Media-observed symptom · tentative attribution · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   Verstappen called a slow stop “very costly”. OpenF1 shows pit-lane times of 23.9 s (lap 13) and 25.3 s (lap 31); the cause and stationary time were not published. Quote: “A slow pit stop was also very costly today, so a few things to analyse and do better.”

   Driver statement · timing data · cause not disclosed · Resolution unconfirmed

   Formula1.com · How everything went wrong for Red Bull (25 Oct) ↗

1. 25 Oct 2026 · Weekend faults & behaviour

   F1 reports Albon touched Alonso and Sainz was squeezed toward the pit wall early on. OpenF1 shows Sainz’s first pit-lane time at 33.6 s — about 9 s longer than usual — with no cause reported.

   Race observation · timing data · no team statement · Resolution unconfirmed

   Formula1.com · Race report (25 Oct) ↗

1. 25 Oct 2026 · Assessment & development

   Albon and Sainz finished 17th and 18th, a lap down, extending Williams’ scoreless run. No post-race reassessment of the medium/high-speed weakness was found.

   Race result only · Not an issue

   Formula1.com · Race report (25 Oct) ↗

1. 30 Oct 2026 · Preparation & specification

   Reliability: the tailpipe vane configuration is trimmed to suit the track's unique ambient and aerodynamic requirements.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Gasly called Friday one of Alpine's best practice days of 2026 but wanted improvement in braking and over high-speed bumps. He reached Q3 in tenth.

   Driver assessment · Monitoring

   Small set-up items by his account; reached Q3.

   Formula1.com · What the teams said, Friday (31 Oct) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Reserve Jak Crawford, in Stroll's car for FP1, had to stop on track with a battery (ERS) problem. Pedro de la Rosa said Stroll's car was “very difficult to drive” in FP2; overnight Aston Martin used a curfew exception and the FIA recorded a survival-cell (chassis) change on car 18. Stroll still reported “big balance issues” all weekend after qualifying 20th. Quote: “We need to investigate the issues with Lance's car because it was very difficult to drive.”

   FIA-documented chassis change · reason undisclosed · Open

   Chassis changed; Stroll says balance issues persist. Cause not disclosed.

   FIA · Doc 40, Survival-cell change, car 18 ↗
2. 1 Nov 2026 · Assessment & development

   Race: Stroll retired on lap 6 with a PU problem, so the race gave no read on the balance issue.

   Race retirement · no balance data · Open

   Aston Martin · Grand Prix reaction (1 Nov) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Freddie Slater drove Bortoleto's car in FP1 (a cooling fan was left on, costing him time). Before FP2 Audi found a problem and mechanics worked in the battery-pack area behind screens, earning a €5,000 fine for covering components. Bortoleto missed most of the session; he said he managed only two laps at the end (the classification lists 12).

   FIA-documented repair work · fault undisclosed · Resolution unconfirmed

   Audi did not disclose the fault.

   FIA · Doc 32, Car 5 covering components ↗
2. 1 Nov 2026 · Assessment & development

   Doc 66: Audi changed the energy-store software parameters on Bortoleto's car before the race. The FP2 fault was still not disclosed.

   FIA-documented parameter change · fault undisclosed · Resolution unconfirmed

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 30 Oct 2026 · Preparation & specification

   FIA Doc 14 lists a new energy store (ES) and control electronics unit (PU-CE) on Hülkenberg's car — his third of each, within the three allowed, so no penalty.

   FIA-documented elements · within allocation · Not an issue

   FIA · Doc 14, New PU elements for this competition ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Hülkenberg said a few things did not work as expected on Friday and the team had open questions to answer overnight. In qualifying he called his laps clean and was 0.03 s from Q3 in 11th.

   Driver-reported · not specified · Monitoring

   Saturday (31 Oct): “steady progress” — improvement, not a stated fix.

   Audi · Friday release (30 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Hülkenberg said Audi struggled with temperatures throughout and had “a few things to look into and understand” (separate record).

   Driver statement · persists · Open

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 30 Oct 2026 · Preparation & specification

   Performance (local load): revised deflector geometry increases local rear-corner aerodynamic load, improving overall aerodynamic performance.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Preparation & specification

   Cadillac fitted Bottas's fifth ICE and turbocharger and fourth ES, PU-CE and MGU-K — all over the allowance, a 50-place penalty that sends him to the back. Colton Herta drove the car in FP1. Cadillac did not link the change to Bottas's stop in Austin.

   FIA-documented elements · over allocation · Not an issue

   FIA · Doc 17, Car 77 PU elements ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Bottas said they had to keep an eye on reliability, particularly brakes and engine; team principal Marcin Budkowski called the circuit difficult for cooling and brakes.

   Driver and team assessment · Open

   Named as a risk on Friday; no later update.

   Formula1.com · What the teams said, Friday (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: no brake or engine failure was reported. Bottas retired with a front-left suspension failure (separate record).

   Race running · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 30 Oct 2026 · Preparation & specification

   Circuit-specific cooling range, declared together with the enlarged rear bodywork exit: extends the top end of engine-cooling capacity, at the expense of car efficiency.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Preparation & specification

   Circuit-specific cooling range, declared together with additional top sidepod louvre panels: extends the top end of engine-cooling capacity, at the expense of car efficiency.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Hamilton lost power on his qualifying simulation, was ordered to stop on track and missed the long run. Ferrari used one of its curfew exceptions overnight; media report the unit was swapped for one already in his allocation, so no grid penalty. Ferrari has not published a diagnosis. Quote: “They’re still investigating to find out what was wrong, and just praying that everything’s okay.”

   Team-confirmed PU problem · replacement reported · cause undisclosed · Monitoring

   Ran FP3 and took pole without a reported recurrence; no team statement that the cause is fixed.

   Formula1.com · Hamilton on his FP2 stoppage (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Hamilton ran all 71 laps, finished second and set the fastest lap with no reported problem. Doc 66 records a low-pressure fuel pump change on his car before the race; Ferrari has not published a diagnosis of the FP2 failure.

   Race running · FIA part change · no diagnosis · Monitoring

   FIA · Doc 66, Parts replaced during parc fermé ↗
3. 8 Nov 2026 · Assessment & development

   São Paulo FP3 (7 Nov): Hamilton's new engine vibrated, lost power and smoked; Ferrari fitted a complete new PU (Doc 43). Not linked by Ferrari to Mexico.

   FIA-documented replacement · separate failure · Monitoring

   Formula1.com · Hamilton to start from the back (7 Nov) ↗

1. 30 Oct 2026 · Preparation & specification

   Ferrari were the only team to keep both race drivers in FP1; Hamilton's first runs carried an aero rake, so he lost part of the session to measurement work rather than set-up.

   Team test programme · Not an issue

   Formula1.com · Hamilton on his FP2 stoppage (31 Oct) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Bearman pulled in with smoke at the end of FP1 — first thought to be a brake fire, but a PU issue. Haas changed the engine and other damaged parts before FP2; Bearman said they lost the latest-spec engine and had to go back to the previous one, which costs performance. Quote: “We encountered a lot of issues in FP1, as we lost our latest spec engine, so we’re having to revert to the previous one which is a shame.”

   Team-confirmed PU failure · performance cost · Monitoring

   Replacement ran from FP2; the latest-spec unit's performance is lost for this weekend.

   Formula1.com · What the teams said, Friday (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: still on the older-spec engine, Bearman had “really good” race pace by Komatsu's account until he was taken out at the restart.

   Team principal assessment · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Ocon reported “no power steering” on his installation laps and returned to the garage. He said the team quickly fixed it. It was his last session: Haas replaced him with Ryo Hirakawa for the rest of the weekend, giving no reason other than that he was not ill. Quote: “In FP2, we had a small issue at the start of the session, which we quickly fixed.”

   Driver statement · fixed · Solved

   Ocon (30 Oct): “a small issue at the start of the session, which we quickly fixed.”

   Formula1.com · What the teams said, Friday (31 Oct) ↗

Resolution: Ocon (30 Oct): “a small issue at the start of the session, which we quickly fixed.”

1. 30 Oct 2026 · Preparation & specification

   Circuit-specific cooling range: louvres extended forwards and reshaped to cope with Mexico City's power-unit cooling challenge.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Racing director Randy Singh said managing PU and brake temperatures would be crucial in the race, especially in traffic, and noted front-wheel locking across the field on Friday.

   Team assessment · Monitoring

   Race-day risk named by the team, not a failure.

   Formula1.com · What the teams said, Friday (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: neither McLaren reported a brake or PU temperature problem.

   Race running · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   After sharing his car with Leonardo Fornaroli in FP1, Norris was second in FP2 but flat-spotted his mediums with a big lock-up, ruling that set out for the long run. He said the car is still a challenge to drive; after qualifying he again called it unpredictable. Quote: “Not a bad day on the timesheets at the end of Free Practice 2, but the car is still proving a challenge to drive.”

   Driver-reported · ongoing since Austin · Open

   No team statement that the handling issue is fixed.

   Formula1.com · What the teams said, Friday (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Norris called his race pace “exceptionally strong” and did not repeat the handling complaint. McLaren bring upgrades to Brazil.

   Driver assessment · improvement, no stated fix · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗
3. 8 Nov 2026 · Assessment & development

   São Paulo: Norris won and said the new front wing package performed exactly as expected; no statement that the earlier handling problem is fixed.

   Driver assessment · Monitoring

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Trackside engineering director Andrew Shovlin said the car lacked stability on corner entry, which turned into understeer at the apex, on both single laps and long runs. He also said brake and PU cooling needed management and they would like more margin. Quote: “We’re struggling with a lack of stability on entry that moves to apex understeer.”

   Team engineering assessment · open limitation · Open

   No later team statement that the balance problem was solved.

   Formula1.com · What the teams said, Friday (31 Oct) ↗

1. 30 Oct 2026 · Preparation & specification

   Circuit-specific cooling range: an optional additional forward louvre panel extends the cooling range in extreme conditions by increasing airflow through the radiators.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Preparation & specification

   Circuit-specific cooling range: the main cooling exit at the rear of the bodywork is enlarged to increase available engine cooling for the circuit's high demands.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Preparation & specification

   FIA Doc 14 lists a new ES and PU-CE on both Lawson's and Lindblad's cars — the third of each for both, within the allowance.

   FIA-documented elements · within allocation · Not an issue

   FIA · Doc 14, New PU elements for this competition ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   The FP2 clash with Verstappen through the stadium damaged Lawson's front wing; he resumed and finished ninth. Both drivers got one-place grid drops and a penalty point.

   Stewards' decision · damage confirmed · Resolution unconfirmed

   No later damage report.

   Formula1.com · Verstappen and Lawson grid penalties (31 Oct) ↗

1. 30 Oct 2026 · Preparation & specification

   Reliability: exit area increased to recover cooling mass flow through the radiators, by extending the existing louvres and adding optional louvres further outboard.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   On FP1 radio Hadjar reported his steering wheel was not sitting straight and complained about the brakes, limiting him to a few push laps. He said the team sorted it quickly and he completed long running at the end of FP1. Quote: “FP1 was a tricky session for us with only a few push laps on the board, but we managed to sort the issue out quickly and get some long running at the end.”

   Driver-reported fault · driver says sorted · Solved

   Hadjar (30 Oct): “we managed to sort the issue out quickly.”

   Formula1.com · What the teams said, Friday (31 Oct) ↗

Resolution: Hadjar (30 Oct): “we managed to sort the issue out quickly.”

1. 30 Oct 2026 · Preparation & specification

   Performance (local load): attached to the existing sidepod geometry to improve the flow below the radiator-duct inlet, gaining local load while maintaining stability.

   FIA declared upgrade · individual-car fitment not established · Not an issue

   FIA Car Presentation Document 12 ↗

1. 30 Oct 2026 · Preparation & specification

   FIA Doc 12 lists extra cooling exits on the engine cover and a revised sidepod with a new floor-to-sidepod split line — cooling hardware aimed at Mexico's thin air. No post-session verdict on either part was published.

   FIA-documented hardware; objectives, not measured gains · Not an issue

   FIA · Doc 12, Car Presentation Submissions ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Contact with Lawson exiting the stadium section broke bodywork off Verstappen's floor and brought a red flag; his FP2 best came in a car short of downforce. Technical director Pierre Waché said the damage would be fixed for FP3. The stewards gave him a one-place grid drop. Quote: “In FP2, the performance of Max’s car was clearly affected by some damage, which we will be able to fix for FP3.”

   Team-confirmed damage · repair planned · Monitoring

   Waché said it “will be” fixed for FP3 — a plan, not a confirmation; no further damage reported.

   Formula1.com · What the teams said, Friday (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Verstappen won with no damage or floor problem reported. Red Bull never explicitly confirmed the FP2 repair.

   Race running · no explicit confirmation · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 30 Oct 2026 · Weekend faults & behaviour

   Both drivers used Friday for experimental set-ups and said FP2 changes made the car more predictable. No technical faults were reported.

   Team assessment · Not an issue

   Formula1.com · What the teams said, Friday (31 Oct) ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Managing director Steve Nielsen said Colapinto was more limited under braking than Gasly and lost time in the final sector, where the rear tyres overheat; the team also had trouble with tyre preparation in FP3. Colapinto said he lacked pace from Turn 10 onwards. He qualified 12th.

   Team assessment · open limitation · Open

   Named by the team after qualifying; no fix stated.

   TN · Alpine's Nielsen on qualifying (31 Oct) ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Alonso, quickest early in Q1, was told to stop at Turn 14, bringing a red flag; Aston Martin called it an engine issue, reports cite an ERS water-pressure warning, and smoke was seen earlier in the lap. He had also reported downshift problems and spun at Turn 1 in FP3. Classified 18th; reprimanded for not refitting his steering wheel.

   Team-confirmed engine issue · reported ERS water pressure · Open

   No diagnosis or race-day PU decision published by 1 Nov.

   Grande Prêmio · Alonso after Q1 failure (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: the problem came back. Both cars pitted on lap 3 with abnormal PU-system pressures; Alonso retired after five laps, saying “the same MGUK issue that stopped us in Qualifying reoccurred”, despite the MGU-K and water-pump changes in Doc 66.

   Driver statement · recurrence · Open

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 31 Oct 2026 · Assessment & development

   Alonso was seventh in FP1 and called Friday the closest the team had been to the front; de la Rosa credited low-speed corners. Neither car reached Q2 (P18 and P20).

   Team assessment plus timing · Not an issue

   Aston Martin · Mexico City GP weekend page ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Bortoleto aborted his first FP3 push lap after reporting an engine problem; smoke appeared from the rear out of Turn 6 and Audi changed the power unit, so he went into qualifying with about 14 laps of the weekend. He qualified 14th.

   Driver-reported · team PU change · no diagnosis · Monitoring

   Replacement ran through Q2 without a reported recurrence; no diagnosis published.

   Grande Prêmio · Bortoleto PU change after FP3 smoke (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Bortoleto's replacement PU ran all 71 laps without a reported problem; Audi changed the energy-store software parameters before the race (Doc 66). No diagnosis published.

   Race running · no diagnosis · Monitoring

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 31 Oct 2026 · Assessment & development

   Allan McNish called Bortoleto's P14, with so little running, exceptional and credited both crews for readying the car.

   Team assessment · Not an issue

   Audi · Mexico City GP qualifying page ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Pérez left the garage seven minutes into FP3 on new softs but lost power before a timed lap and returned; Cadillac called it a precautionary PU change before qualifying. He qualified 21st and said missing FP3 cost him set-up work. Quote: “We are carrying out a precautionary power unit change on Checo’s car ahead of qualifying.”

   Team-confirmed precautionary change · fault undisclosed · Monitoring

   New unit ran in qualifying; no diagnosis published.

   Grande Prêmio · Cadillac changes Pérez's PU (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Pérez's replacement PU ran all 71 laps without a reported failure. No diagnosis of the FP3 power loss published.

   Race running · no diagnosis · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗
3. 8 Nov 2026 · Assessment & development

   São Paulo: Cadillac fitted a fifth ICE and turbo and fourth MGU-K on Pérez's car after the Mexico problem (Doc 39, 30-place drop).

   FIA-documented replacement · Monitoring

   FIA · Doc 39, Car 11 PU element changes ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Leclerc topped FP1, FP2 and the first Q3 run, but said getting the tyres into the window on out-laps is where Ferrari struggle most, and on his final run “the car felt very different compared to before”. He qualified third, 0.119 s off Hamilton. Quote: “The out-laps were very difficult as well, to put the tyres in the right window. This is where we struggle the most.”

   Driver-reported symptom · cause unknown · Resolution unconfirmed

   No explanation for the Q3 balance change published.

   FIA · Post-qualifying press conference (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Leclerc said he struggled on the dirty side after the restart, then flat-spotted a tyre. No explanation for Saturday's Q3 balance change was published.

   Driver statement · cause unknown · Resolution unconfirmed

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 31 Oct 2026 · Assessment & development

   Hamilton took pole in 1:16.514, 0.009 s ahead of Russell, despite the FP1 rake running and the FP2 engine issue. He said the set-up work had paid off and the car was working well. Quote: “Obviously, FP1, we had a rake running, and we obviously then had the engine issue we had yesterday, which meant that we were just on the back foot.”

   Timing result plus driver statement · Not an issue

   Formula1.com · Hamilton pole reaction (31 Oct) ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Bearman briefly parked in a run-off area in FP2 and needed a software change. He said the car “was just not working at all” in FP3, then felt very good in qualifying, where his best Q2 lap was deleted for track limits at Turn 12 (15th).

   Driver-reported · software fix applied · Monitoring

   Bearman (31 Oct): “the car felt very good” — improvement, cause not explained.

   Haas · Qualifying recap (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Doc 66: Haas replaced the brake-by-wire unit and its parameters on Bearman's car before the race. Not linked by the team to the FP2 software change.

   FIA-documented part change · Monitoring

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   The stewards approved Hirakawa (racing as No. 50) replacing Ocon from FP3, using the engine and tyres allocated to Ocon. Hirakawa had driven FP1 without issues and qualified 19th; Haas said traffic spoiled his final Q1 lap.

   FIA driver-change decision · Not an issue

   FIA · Doc 36, Haas driver change ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Fourth in FP3 and Q1, Piastri was eliminated 13th in Q2. McLaren ran used softs first, so his only new-tyre lap came last; he said that set “just had no grip” and the balance was “completely different”. Pundits blamed tyre temperature; McLaren had not given a technical explanation. Quote: “The new set of tyres we put on in Q2 just had no grip. Not sure what happened there but the balance was completely different somehow.”

   Driver-reported symptom · cause not established · Open

   Piastri (31 Oct): “just try and understand what happened first.”

   Formula1.com · Piastri on his Q2 exit (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Piastri climbed from 12th to seventh before his collision; McLaren published no explanation for the Q2 grip loss. Doc 66 shows ICE, MGU-K, exhaust and cooling parts changed before the race, but McLaren did not link them to it.

   No explanation published · Open

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 31 Oct 2026 · Assessment & development

   Norris topped FP3 by 0.001 s and topped Q1 and Q2, but a lock-up on his final Q3 lap left him sixth. Piastri starts 13th.

   Timing result · Not an issue

   Crash.net · Qualifying results and report (31 Oct) ↗

1. 31 Oct 2026 · Assessment & development

   Russell qualified second; Antonelli fifth (starts fourth after Verstappen's penalty). Antonelli said he was still not fully recovered from the fever that kept him out of Thursday's media day — a driver-health factor, not a car issue.

   Timing result · Not an issue

   Sports Illustrated México · Qualifying reactions (1 Nov) ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Russell said he had struggled all weekend until one lap in Q3 and still does not fully understand the upgraded car — “the hit rate is too low”. He credited falling track temperature and a quick out-lap for the lap that put him 0.009 s off pole. Quote: “I’m still struggling to get on top of this car, to be honest, because it’s been a very difficult weekend up until one lap in Q3.”

   Driver-reported · ongoing since Austin · Open

   Russell (31 Oct): still struggling to get on top of this car.

   FIA · Post-qualifying press conference (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Russell's start was compromised by a deployment issue (separate record). Wolff: “The car just didn't work for him this year.”

   Team principal statement · persists · Open

   Motorsport.com · Wolff apologises to Russell (2 Nov) ↗
3. 8 Nov 2026 · Assessment & development

   São Paulo: Russell said he felt much more like himself, but Mercedes said both drivers had an unusual balance on slicks that it needs to understand.

   Driver and team statements · not fixed · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   The FIA technical delegate reported that just after Lawson's fastest Q2 lap the driver power demand and MGU-K electrical power were cut faster than the rules allow (C5.12.6/7). Lawson qualified eighth (ninth after his FP2 penalty); technical breaches usually lead to disqualification from qualifying.

   FIA technical delegate report · stewards' decision pending · Open

   Hearing set for 17:30 local; no decision published when this page was updated.

   FIA · Doc 53, MGU-K infringement, car 30 ↗
2. 1 Nov 2026 · Assessment & development

   Stewards' decision: Lawson disqualified from qualifying. The battery ran out at the end of his fastest Q2 lap, so MGU-K power fell from 350 kW to zero at once instead of the permitted ramp-down; Racing Bulls had self-reported it and argued no performance gain, which the stewards said cannot excuse a technical breach. He started from the pit lane after further parc fermé changes.

   Stewards' decision · disqualified · Open

   Grandprix.com · Lawson disqualified from qualifying (1 Nov) ↗
3. 1 Nov 2026 · Assessment & development

   Race: Racing Bulls changed Lawson's whole ICE/turbo/exhaust/PU-ANC set and the suspension set-up in parc fermé (Docs 64–65) and he started from the pit lane, finishing seventh. No team statement on the deployment behaviour.

   FIA documents · no team statement on the fix · Open

   FIA · Doc 64, Parc fermé issues (car 30 PU) ↗

1. 31 Oct 2026 · Assessment & development

   Team principal Alan Permane said the car worked well on short and long runs, and FP1 included aero tests comparing specifications. Lindblad made Q3 in ninth (starts eighth) but said his driving was “not good enough”.

   Team assessment · Not an issue

   Formula1.com · Lindblad after Q3 (31 Oct) ↗

1. 31 Oct 2026 · Assessment & development

   Verstappen qualified fourth (starts fifth after the FP2 penalty). He said dirty air from two cars cost downforce through Turn 12, then Norris on the right of the track took away his braking reference for the hairpin and he locked up. Hadjar's first Q3 lap had an error he could not recover from; he qualified seventh.

   Timing result plus driver explanation · Not an issue

   Crash.net · Verstappen on his ruined final lap (31 Oct) ↗

1. 31 Oct 2026 · Weekend faults & behaviour

   Waché said the long run was “more or less there” but neither driver was happy with the balance. Verstappen said the car was “very difficult to drive” through practice; after “quite a few changes” before qualifying it felt much better, and he was on a pole-contending lap until traffic at Turn 12. Quote: “In free practice, the car was very difficult to drive and we didn’t have a good balance. In qualifying, it was okay. We’ve made progress.”

   Driver assessment · set-up change, no hardware fix · Monitoring

   Verstappen (31 Oct): “We’ve made progress” — improvement, not a stated fix.

   Verstappen.com · Qualifying reaction (31 Oct) ↗
2. 1 Nov 2026 · Assessment & development

   Race: Verstappen won. Mekies said the team had turned the car around in difficult conditions — an improvement, not a statement that the practice balance problem was solved.

   Team statement · improvement · Monitoring

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 31 Oct 2026 · Assessment & development

   Sainz reached Q2 but aborted a lap and set his final time on used softs (16th); Albon missed the Q1 cut by 0.111 s after losing time into Turn 1.

   Team report · Not an issue

   Williams · Qualifying report (31 Oct) ↗

1. 1 Nov 2026 · Assessment & development

   Colapinto and Gasly finished eighth and tenth on the road, but post-race penalties for not slowing under yellow flags (Colapinto 10 s; Gasly a stop-and-go converted to 30 s) dropped them to 15th and 17th. Briatore was happier with the race pace than with qualifying. Quote: “I'm happy with the performance and the pace we showed in the race compared to Qualifying, but I'm less happy with the final result.”

   Stewards' decisions · team assessment · Not an issue

   Formula1.com · Alpine pair lose points after post-race penalties (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Gasly said he made a good launch but then lost power on the straight, which cost him several places, and had power problems again at the restarts. Flavio Briatore also mentioned the power issues at the start. Like Russell's car, Gasly's has a Mercedes power unit; Alpine gave no cause. Quote: “I had a really good launch off the line but then lost power on the straight, which cost us a number of places.”

   Driver-reported symptom · cause not disclosed · Open

   Gasly: “a few things for us to look at on our side.”

   Formula1.com · What the teams said, race day (2 Nov) ↗
2. 8 Nov 2026 · Assessment & development

   São Paulo race: Gasly reported poor wet grip and odd aero data, not a power loss. No cause published for Mexico's power loss.

   Driver statement · no repeat reported · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Before the race Alpine replaced the PU sump protection bumper, a left-rear suspension gaiter panel and the right-front rim seal on Gasly's car.

   FIA-documented part changes · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Both Aston Martins pitted at the end of lap 3 with “abnormal pressure levels in the PU systems”. Alonso pitted again and retired in the garage, classified with five laps. He said it was the same MGU-K problem that stopped him in Q1, even though the MGU-K and water pump had been changed overnight. Quote: “The same MGUK issue that stopped us in Qualifying reoccurred and forced us to stop.”

   Team-confirmed PU fault · driver says same issue as qualifying · Open

   Recurred after the parc fermé repair; no diagnosis published.

   Aston Martin · Grand Prix reaction (1 Nov) ↗
2. 8 Nov 2026 · Assessment & development

   São Paulo: Alonso finished the race (P12) with no MGU-K problem reported. No fix was announced.

   Race running · no fix statement · Monitoring

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 1 Nov 2026 · Assessment & development

   This was the Honda-powered team's fifth double retirement of the season (RacingNews365). Team principal Adrian Newey said the pace had been there. Quote: “It has been a disappointing day, especially as Fernando showed very good pace all weekend.”

   Team assessment plus media count · Not an issue

   RacingNews365 · Aston Martin double retirement (1 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   After Alonso's Q1 stop Aston Martin fitted a previously used MGU-K, a new ERS and ICE water-pump assembly, crank seal and flywheel, plus a new steering wheel and radio harness. Stroll's car received a previously used ICE, turbo, energy store, control electronics and ancillaries, plus an energy-store header-tank quick-disconnect.

   FIA-documented part changes · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Stroll pitted with Alonso at the end of lap 3, then was told to stop on track to avoid damaging the battery, which brought out a short VSC. His car had been rebuilt with a different set of previously used PU elements before the race. Quote: “We had an issue and had to stop the car on Lap 6 to avoid damaging the battery.”

   Team-confirmed PU fault · cause undisclosed · Open

   No diagnosis published; Brazil follows in five days.

   Aston Martin · Grand Prix reaction (1 Nov) ↗
2. 8 Nov 2026 · Assessment & development

   São Paulo race (8 Nov): Stroll retired again with a battery issue, confirmed by Stroll and Mike Krack. Not stated whether it is the same fault as Mexico.

   Team-confirmed repeat symptom · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 1 Nov 2026 · Assessment & development

   Bortoleto finished eighth after post-race penalties to others. He said practice problems left the team going in “a bit blind” on tyre management and set-up. Allan McNish said the priority had been to have both cars running reliably, and they did. Quote: “We had almost no data after the issues we had throughout the practice sessions.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Before the race Audi changed the energy-store software parameters on Bortoleto's car, after a weekend of battery and PU trouble. The car then ran all 71 laps.

   FIA-documented parameter change · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Hülkenberg said Audi fought temperatures throughout, which kept him out of a position to fight. At the second standing start he followed Bearman too closely into Turn 4, lost front downforce and hit him; the stewards gave him 10 s (Doc 74) and he finished 14th. Quote: “We struggled with temperatures throughout, which made it difficult to really get into a position to fight.”

   Driver-reported · cause not specified · Open

   Hülkenberg: “a few things to look into and understand.”

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Assessment & development

   Budkowski called Mexico Cadillac's most competitive weekend yet in relative pace, with both drivers fighting in the pack, but said the team's operations fell short at the stops. Quote: “It was our most competitive weekend in terms of relative pace and very encouraging to see both drivers fighting in the pack.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   On lap 44, braking for Turn 1 at around 320 km/h, Bottas's front-left suspension failed. The car spun and hit the TecPro barrier rear-first, bringing the Safety Car and then the lap-45 red flag. He was checked at the medical centre and released. Cadillac has not said which part failed. Quote: “We will fully investigate the cause of this failure and ensure such accidents do not happen again.”

   Team-confirmed failure · under investigation · Open

   Budkowski (1 Nov): “We will fully investigate the cause of this failure.”

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Before the race Cadillac replaced the front floor structure brackets on Pérez's car and fitted a new PU ancillary component to Bottas's.

   FIA-documented part changes · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   A wheel-gun problem at Pérez's first stop cost him track position. The 5 s pit-lane speeding penalty (80.2 km/h in an 80 km/h zone, Doc 71) was, he said, “caused by a sensor issue”. Marcin Budkowski said both cars had equipment problems at their stops. Pérez finished 16th in his 300th Grand Prix. Quote: “A slow pit stop due to an issue with one of the wheel guns cost us valuable track position.”

   Driver and team statements · fault not detailed · Resolution unconfirmed

   Cadillac did not detail the sensor or pit-equipment faults.

   Formula1.com · What the teams said, race day (2 Nov) ↗
2. 8 Nov 2026 · Assessment & development

   São Paulo race: Pérez had another very slow stop and said it was the same problem as in Mexico — the team needs to fix its tools.

   Driver-reported repeat · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 1 Nov 2026 · Assessment & development

   Hamilton set the race's fastest lap (1:19.268) and finished 0.799 s behind Verstappen; he said Ferrari had the pace to win. Fred Vasseur said the car had made a big step in raw performance over the last few rounds. Neither car reported a technical problem in the race. Quote: “We have done so much work and made a huge step forward in terms of pure performance over the last couple of rounds.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Hamilton passed Leclerc at the standing restart, and Leclerc then locked up, flat-spotting his tyres; Antonelli took third from him soon after. Pirelli said the slide wore the front-left “very close to the internal structural layers”. Leclerc said he struggled on the dirty side of the grid at the restart, and the flat spot made it hard to keep Norris behind, but he held fourth. Quote: “After the restart, on the dirty side of the track, I struggled, and then had a flat spot which made it really tough to fight off Lando (Norris) for the rest of the race.”

   Driver statement · tyre supplier observation · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Ferrari replaced the low-pressure fuel pump on Hamilton's car before the race — the same part was changed on his car at Sepang (see tracker) — plus the right-rear brake-disc infrared sensor and the headrest on Leclerc's car. Ferrari did not link the fuel pump to Hamilton's FP2 power loss.

   FIA-documented part changes · no fault disclosed · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Assessment & development

   Ayao Komatsu said Bearman's race pace was “really good” — quicker than Audi — even on the older-spec engine. Hirakawa passed both Williams late on and finished tenth after the post-race penalties. Komatsu said the crews never missed a session, despite some big changes. Quote: “I just want to say thanks to all the crews here, they’ve had a lot to work on this weekend and we never missed a session, even with some big changes.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Bearman was in the points at the second standing start when Hülkenberg ran into his rear at Turn 4 and spun him (Hülkenberg got 10 s, Doc 74). Haas said the damage was too great to continue. Quote: “I just got smashed off. I was turning into Turn 4, and the next thing I knew, I was looking at everyone else coming past me, facing the wrong way.”

   Collision · stewards' decision · Not an issue

   Haas · Race recap (1 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Before the race Haas replaced the brake-by-wire unit (and its parameters) on Bearman's car. Hirakawa received a new PU ancillary component, within the allowance.

   FIA-documented part changes · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Assessment & development

   Stella said the race confirmed a podium-level car, and called Piastri's penalty harsh. Neither driver reported a brake or PU temperature problem, which the team had flagged on Friday as a risk. Quote: “The race confirmed that we had the potential to finish on the podium.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Norris spent his first stint behind Russell and his second behind Leclerc and could not pass either on track. He blamed his grid slot and “the straight-line speed limiter, which made overtaking virtually impossible”. Andrea Stella blamed limits set by the technical regulations. McLaren will bring upgrades to Brazil. Quote: “The race pace today was exceptionally strong and capable of at least fighting for a podium, if not for the win.”

   Driver and team assessment · regulation limit, not a fault · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Piastri lost seventh to Lindblad at the final restart and hit the Racing Bulls' left rear on lap 59 while trying to take it back, losing a large section of right-side bodywork. He finished the race with the damage; the stewards gave him 10 s, which dropped him from seventh to 13th. Quote: “Despite the damage picked up towards the end, we carried on through the final laps and still had enough pace to hang on, even if the last stint wasn’t easy.”

   Collision damage · stewards' decision · Resolution unconfirmed

   One-off collision damage, carried to the flag.

   FIA · Doc 79, Car 81 causing a collision ↗

1. 1 Nov 2026 · Preparation & specification

   Between qualifying and the race McLaren fitted a previously used ICE, MGU-K and exhaust to Piastri's car (from his allocation, so no penalty), plus new PU hydraulic assemblies, the centre intake cooling duct, radiator assemblies and the oil-water heat exchanger. McLaren gave no reason and did not link the work to his Q2 grip loss.

   FIA-documented part changes · reason undisclosed · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Assessment & development

   Shovlin said Antonelli ran the Soft beyond 40 laps in the first stint, which gave Mercedes options until the red flag reset the race; Pirelli said his 43-lap stint showed very little degradation. He restarted fourth, passed Leclerc and finished third to clinch the title. Wolff said Mercedes had “completely let him down” about Russell's car. Quote: “He did a really good job managing the Soft tyre in the first stint and was able to run it beyond 40 laps.”

   Team engineering assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Before the race Mercedes replaced the right-front ‘caketin’ bulkhead (the bodywork around the front suspension) on Russell's car, and the floor bib stay and right-rear brake drum on Antonelli's.

   FIA-documented part changes · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Starting second, Russell did not have full electrical deployment down the 1.2 km run to Turn 1 and lost several places before the first corner. He then hit Hadjar at Turn 6 and got a 10 s penalty, and recovered to sixth. Andrew Shovlin called it “the deployment issue on the run to Turn 1”; Toto Wolff said the team did not yet know what had happened. Gasly's Mercedes-powered Alpine also lost power off the line, but neither team has linked the two. Quote: “I made a good start and was in a strong position, but then we suffered an issue which caused me to not have full deployment down the straight.”

   Team-confirmed electrical deployment issue · cause unknown · Open

   Wolff (1 Nov): “At that stage, we don’t know what happened.”

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Assessment & development

   Alan Permane said Lindblad's race was “absolutely superb” until the crash, gaining several tenths a lap while managing his tyres. Lawson went from the pit lane to seventh, helped by post-race penalties. Lawson thought the car's speed was worth more positions. Quote: “He nailed the start and continued to chip away gaining two, three, even four tenths a lap, all while managing his tyres.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   After his qualifying disqualification Racing Bulls fitted Lawson's fifth ICE, turbo and exhaust and his seventh PU-ANC, all over the season allowance (40 grid places). They also changed the suspension set-up and kept working past the covers-on time, without the Technical Delegate's approval. Lawson had to start from the pit lane, which absorbed the grid penalties. Lindblad's car needed only a brake-duct foam seal. Quote: “We took the opportunity to fit a fresh power unit, which he would have needed to take at some point this season anyway.”

   FIA Technical Delegate report · stewards' decision · Not an issue

   FIA · Doc 65, Car 30 changes during parc fermé ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Lindblad was running seventh on lap 59 when Piastri's front-right hit his left rear at Turn 2. The car was launched into the barrier, and the Safety Car came out. The stewards blamed Piastri (10 s).

   Collision · stewards' decision · Not an issue

   FIA · Doc 79, Car 81 causing a collision ↗

1. 1 Nov 2026 · Assessment & development

   Verstappen was the only front-runner to start on Mediums and won by 0.799 s. Hadjar was spun to last by Russell at Turn 6 on lap 1 and recovered to ninth after post-race penalties; he said the car was very fast and the starts were good. Neither driver reported a technical problem. Laurent Mekies praised the work on both chassis and power unit. Quote: “I’m very proud of how the Team has dealt with all the unique challenges of Mexico, both on the chassis side and the PU side.”

   Team assessment · no race-day fault reported · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Preparation & specification

   Before the race Red Bull replaced the lift-pump tower assembly (fuel system) on Hadjar's car, with the Technical Delegate's approval. No problem was reported, and Hadjar ran the full race.

   FIA-documented part change · no fault disclosed · Not an issue

   FIA · Doc 66, Parts replaced during parc fermé ↗

1. 1 Nov 2026 · Assessment & development

   James Vowles said the car lacked pace but credited Mercedes HPP and the team with making sure the altitude did not hurt them, so both cars raced freely from start to finish. Albon said the car felt pretty good. Quote: “It was really great work by HPP and the team to make sure that the high altitudes didn't impact us, and we were able to freely race from start to finish.”

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 1 Nov 2026 · Weekend faults & behaviour

   Sainz said his early switch to a one-stop strategy was working until the chaotic restart. In the final stint the balance went away and overheating made it worse; he finished 12th. Quote: “We tried to fight back on the last stint but the balance went away from us and overheating worsened the situation.”

   Driver-reported symptom · Open

   No team explanation published.

   Formula1.com · What the teams said, race day (2 Nov) ↗

1. 6 Nov 2026 · Assessment & development

   After a clean Friday Krack said reliability seemed more of a positive in Brazil — not a claim the Mexico faults were fixed. Alonso finished with no MGU-K repeat reported.

   Team assessment · Not an issue

   Formula1.com · What the teams said, Friday (6 Nov) ↗

1. 6 Nov 2026 · Weekend faults & behaviour

   Freddie Slater stopped on track with a technical problem in FP1, causing a red flag. Hülkenberg said the team found the problem but ran out of time, so he missed all of FP2. He was back running in FP3 and qualified sixth.

   Team-reported fault · part not disclosed · Monitoring

   Ran FP3, qualifying and the race; the fault was never named.

   Formula1.com · What the teams said, Friday (6 Nov) ↗

1. 6 Nov 2026 · Weekend faults & behaviour

   Dino Beganović, driving Leclerc's car in FP1, managed only 11 laps and no soft-tyre run because of an issue Ferrari did not identify.

   Driver-reported · cause not disclosed · Resolution unconfirmed

   Formula1.com · What the teams said, Friday (6 Nov) ↗

1. 6 Nov 2026 · Preparation & specification

   McLaren was the only team to declare new parts (Doc 12): a completely new front wing for flow conditioning, a new rear wing and beam wing for load, and a small floor change.

   FIA-documented hardware · driver verdict below · Not an issue

   FIA · Doc 12, Car Presentation Submissions ↗

1. 6 Nov 2026 · Weekend faults & behaviour

   Russell said there was understeer to dial out on Friday. Andrew Shovlin called brake locking a recurring recent problem, alongside a compromise between high-speed rear grip and low-speed front-end response.

   Team-reported · ongoing · Open

   Formula1.com · What the teams said, Friday (6 Nov) ↗

1. 6 Nov 2026 · Preparation & specification

   Russell took his sixth ICE on Friday (Doc 14), a five-place drop (Doc 15) that turned P2 in qualifying into P7 on the grid.

   FIA-documented PU change · Not an issue

   FIA · Doc 15, Car 63 PU element change ↗

1. 6 Nov 2026 · Weekend faults & behaviour

   On Friday radio Verstappen complained about downshifts and the steering, calling the car a workout to drive, and stopped early in FP2 while the team checked the steering wheel. He said it needed fixing before qualifying; the team never said what it was or confirmed a fix. Quote: “I had some issues with the steering, which we’ll need to fix ahead of qualifying.”

   Driver-reported fault · no fix confirmed · Resolution unconfirmed

   Formula1.com · What the teams said, Friday (6 Nov) ↗

1. 6 Nov 2026 · Weekend faults & behaviour

   Sainz's running was restricted on Friday because he was using an older engine; Luke Browning ran a shortened FP1 programme.

   Team-reported · Not an issue

   Formula1.com · What the teams said, Friday (6 Nov) ↗

1. 7 Nov 2026 · Weekend faults & behaviour

   Gasly and Colapinto were 17th and 18th. Steve Nielsen said the lack of pace was puzzling, as strategy and track position were right.

   Team statement · cause unknown · Resolution unconfirmed

   Formula1.com · What the teams said, qualifying (7 Nov) ↗

1. 7 Nov 2026 · Weekend faults & behaviour

   Bortoleto locked up at Turn 12, crossed the grass and hit the wall; rear-wing damage ended his qualifying with a 1:41.564.

   Driver error · damage · Not an issue

   Formula1.com · What the teams said, qualifying (7 Nov) ↗

1. 7 Nov 2026 · Preparation & specification

   Following his Mexico FP3 problem Cadillac fitted Pérez's fifth ICE and turbo and fourth MGU-K (Doc 39): 30 places, so he started last.

   FIA-documented PU change · Not an issue

   FIA · Doc 39, Car 11 PU element changes ↗

1. 7 Nov 2026 · Preparation & specification

   Hamilton's brand-new engine vibrated, lost power and smoked in FP3 after just seven laps. Ferrari removed it for analysis and fitted a complete new power unit (sixth ICE plus TC, exhaust, MGU-K, ES, PU-CE and PU-ANC): a further 65 places (Doc 43), so he started 20th. The cause has not been published.

   FIA-documented replacement · cause not disclosed · Monitoring

   Replacement PU ran the full race; no diagnosis.

   Formula1.com · Hamilton to start from the back (7 Nov) ↗

1. 7 Nov 2026 · Preparation & specification

   Ferrari fitted a fifth ICE to both cars before FP3, one more than the season allowance: 10-place grid drops (Doc 35 for Leclerc). Fred Vasseur said Ferrari chose Brazil to take the penalties because of the overtaking chances and the weather.

   FIA-documented PU change · Not an issue

   FIA · Doc 35, Car 16 PU element change ↗

1. 7 Nov 2026 · Weekend faults & behaviour

   Ayao Komatsu said the hotter FP3 track showed the car's operating window is not wide enough; Bearman qualified eighth but said he had no grip on his Q3 tyres.

   Team principal assessment · Open

   Formula1.com · What the teams said, qualifying (7 Nov) ↗

1. 7 Nov 2026 · Weekend faults & behaviour

   Antonelli reported a steering-wheel problem in FP3 but stayed competitive (second fastest). No cause or fix was published.

   Reported in session · cause not disclosed · Resolution unconfirmed

   Formula1.com · FP3 report (7 Nov) ↗

1. 7 Nov 2026 · Weekend faults & behaviour

   Lindblad was told to stop in Q2 with a power-unit problem and parked behind the barriers. Goss promised a solution for Sunday; the failed part was not identified.

   Team-reported · part not identified · Monitoring

   New ICE/TC fitted; finished P11, no repeat reported.

   Formula1.com · What the teams said, qualifying (7 Nov) ↗

1. 7 Nov 2026 · Weekend faults & behaviour

   Both drivers needed set-up work on Friday. Tim Goss said overnight changes addressed the Sector 2 balance and a better understanding of the Austin aero upgrade gave another small step.

   Team statement · fixed · Solved

   Goss (7 Nov): overnight set-up changes addressed the Sector 2 balance.

   Formula1.com · What the teams said, qualifying (7 Nov) ↗

Resolution: Goss (7 Nov): overnight set-up changes addressed the Sector 2 balance.

1. 7 Nov 2026 · Weekend faults & behaviour

   Hadjar was still unhappy with the balance on Friday (the FP2 set-up direction did not work as expected) and called the car undriveable on FP3 radio. He qualified seventh, then started fifth after penalties to others.

   Driver-reported · balance · Monitoring

   Race: Hadjar said the team is moving in the right direction; P3.

   Formula1.com · What the teams said, qualifying (7 Nov) ↗

1. 7 Nov 2026 · Preparation & specification

   After Friday Red Bull fitted Verstappen's fifth ICE, turbocharger and exhaust plus a sixth PU-ANC, each over the season allowance: 30 grid places (Doc 33), so he started 21st. Laurent Mekies confirmed overnight changes; no fault was named.

   FIA-documented PU change · cause not disclosed · Monitoring

   New elements ran the full race; no diagnosis published.

   FIA · Doc 33, Car 3 PU element changes ↗

1. 8 Nov 2026 · Preparation & specification

   Audi fitted a sixth energy store and control electronics before the race (Doc 57, 10 places), plus rear-wing and rear-corner repairs from his qualifying crash (Doc 58). He reported “power limitations” in wet overtaking; Audi did not explain them.

   FIA-documented PU change · cause not disclosed · Resolution unconfirmed

   FIA · Doc 57, Car 5 PU element changes ↗

1. 8 Nov 2026 · Assessment & development

   Gasly had very poor grip on both Intermediates and full Wets but was competitive on Softs, and reported odd things in the car's aerodynamic data in the wet. Colapinto had low grip at the crossovers. Flavio Briatore said the team must understand how to get the most from the car in the wet. Quote: “It is clear we have work to do to understand how to maximise the car in the wet.”

   Driver and team assessment · open · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Bearman snapped sideways at Turn 3 on lap 1 and the two touched; Alonso carried damage (not specified) and finished 12th, strong in the corners but weak on the straights.

   Team-reported · Resolution unconfirmed

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Stroll retired with a battery issue, confirmed by both him and Mike Krack. The classification records 30 laps, while his quoted statement says lap 38. It follows his battery-protection stop in Mexico; the team has not said whether it is the same fault.

   Driver and team-confirmed · no diagnosis · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Assessment & development

   Hülkenberg recovered from a poor launch and a 10-second penalty to tenth in the late rain. Allan McNish said Audi lacked some dry pace but was strong in the wet.

   Team assessment · Not an issue

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   The right-rear wheel nut on Bottas's car could not be removed before the start. Cadillac's Marcin Budkowski said it was cross-threaded; the team could not free it, so Bottas did not start. Why it cross-threaded is being investigated.

   Team-diagnosed · not fixed in time · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Pérez had a very slow stop (about 9.8 s stationary on lap 15) and said it was the same problem as in Mexico: the team needs to fix its tools.

   Driver-reported · repeat of Mexico · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Leclerc made contact with Lawson at Turn 12 and passed him five corners later on the penultimate lap. The stewards gave him five seconds (reduced from ten because of the wet conditions and minor contact), which dropped him back behind Lawson to eighth. Lawson told the stewards the contact damaged his left-rear rim.

   Stewards' decision · Not an issue

   FIA · Doc 79, Car 16 causing a collision ↗

1. 8 Nov 2026 · Assessment & development

   Hamilton went from 20th to ninth on lap 1, then struggled with the rear tyres, spun as the rain came back and finished ninth on his 400th start. Leclerc said he had no grip early because the tyres would not come up to temperature. Vasseur said both cars struggled to get the tyres into the right window and Ferrari must understand the cold-weather weakness before Las Vegas.

   Team principal assessment · open · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Bearman snapped sideways at Turn 3 on lap 1 and damaged the rear impact structure. Komatsu said the damage had a huge impact on the pit stop, which ruined his race (P17).

   Team-confirmed damage · Resolution unconfirmed

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Preparation & specification

   After Câmara's Q2 crash Haas replaced the right-hand front and rear suspension, steering rack, track rods, brake scoops, nose and front wing, T-tray tip, pitot and an oil-pressure sensor (Doc 58).

   FIA-documented part changes · Not an issue

   FIA · Doc 58, Parts replaced during parc fermé ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Norris lost the lead to Antonelli and second to Lawson at the start because of wheelspin. No fault was blamed.

   Driver-reported · Not an issue

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Assessment & development

   Norris won by 14.6 s from pole and said the new front wing and package worked as expected, though McLaren was still a tenth or two off in dry practice. Andrea Stella saw positive signs and said the low temperatures suited the car. Piastri (P6) said the car had taken a step but must become quicker and easier to drive. Quote: “The new front wing and upgrade package we introduced this weekend performed exactly as expected.”

   Driver and team principal assessment · Not an issue

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Assessment & development

   Antonelli led from lap 1 to 19 but said the rear became very unstable on slicks, especially in high-speed corners, before spinning at Turn 1 on lap 20. Russell spun leaving the pits on Softs, which he put down to taking too much risk. Shovlin said Russell reported a similar balance to Antonelli's and the team must understand it. Toto Wolff said they had winning pace but suffered at both transitions; P4 and P5 clinched the Constructors' Championship.

   Driver and team assessment · open · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Assessment & development

   Lawson ran second early on great initial grip but lacked long-stint pace; he regained seventh after Leclerc's penalty. Lindblad said the last 20 laps were hard because of wet drivability problems that made the car hard to keep on track.

   Driver statements · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Assessment & development

   Verstappen made up eight places on lap 1 and was strong on Intermediates, but said the car had a lot of oversteer on slicks before improving again on the late Intermediates. Mekies said the switch to dry tyres brought a significant change in balance that the team needs to understand. Quote: “We struggled with a lot of oversteer, which made the car difficult to drive.”

   Driver and team principal assessment · open question · Open

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Assessment & development

   Albon reached Q3 in the wet but faded as the track dried and got a five-second penalty for rejoining unsafely; he finished 15th, Sainz 19th. James Vowles said the result exposed where the car is and where it needs to be.

   Team principal assessment · Not an issue

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Preparation & specification

   Doc 58 records a right-hand floor board and an engine-sump Timesert on Albon's car, and a brake-reservoir cap and bellow on Sainz's. No fault was described.

   FIA-documented part changes · Not an issue

   FIA · Doc 58, Parts replaced during parc fermé ↗

1. 8 Nov 2026 · Weekend faults & behaviour

   Sainz had heavy understeer and front graining in the first Intermediate stint; his last stint on Inters was much better.

   Driver-reported · Resolution unconfirmed

   Formula1.com · What the teams said, race day (8 Nov) ↗

1. 8 Nov 2026 · Preparation & specification

   After his Q2 failure Racing Bulls fitted a seventh ICE and sixth turbocharger plus a new pneumatic bottle and pressure regulator (Docs 56 and 58): 10 places, so he started 18th.

   FIA-documented PU change · Not an issue

   FIA · Doc 56, Car 41 PU element changes ↗