Toyota bulletin TSB010421
What it saysTSB: Some 2018 ? 2024 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, M20A-FKS, or M20A-FXS engine may exhibit one or more of the following conditions: ?Milky/discolored engine oil. ?An ?Oil Pressure… NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Feb 15, 2024, received Apr 1, 2024, about the service brakes. It names 52 model years (2018–2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationTSB: Some 2018 ? 2024 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, M20A-FKS, or M20A-FXS engine may exhibit one or more of the following conditions: ?Milky/discolored engine oil. ?An ?Oil Pressure Low? warning message on the Multi-information Display (MID). ?A MIL ON condition with Diagnostic Trouble Codes (DTCs) P05202A (Engine Oil Pressure Sensor/Switch ?A? Signal Stuck in Range) and/or P052477 (Engine Oil Pressure Too Low [Severe]) present. Moisture from blow-by gases condenses and accumulates in the engine oil during short trips in extreme cold weather. When the moisture in the oil freezes, the oil pressure may drop, and the aforementioned warning indicators may display. Follow the procedures in this bulletin to address these conditions.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| TSB010421 | Service bulletin | Feb 15, 2024 | 10252251 | not found |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
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Model years it names
Source: as the manufacturer filed themand 12 more on this site: 2022 Toyota RAV4 Prime, 2021 Toyota RAV4 Prime, 2024 Toyota Sequoia, 2023 Toyota Sequoia, 2024 Toyota Sienna, 2023 Toyota Sienna, 2022 Toyota Sienna, 2021 Toyota Sienna, 2024 Toyota Venza, 2023 Toyota Venza, 2022 Toyota Venza, 2021 Toyota Venza.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 52 model years this bulletin names have filed 8,202 complaints with NHTSA since 2015. 2,905 of them name Engine, Electrical System, Service Brakes — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2018 Toyota Camry, the 72 owners who gave an odometer reading for Service Brakes reported it at a median of 53,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Excessive oil consumption - new vehicle newly purchased 2019 Toyota Avalon xle (6 cyl) has excessive oil consumption. Required addition of 2 quarts of oil at 2,000 miles. No leaks evident under car. At 3,100 "low oil" light came on, but could not check because dealer taped dipstick to prevent me from checking. Dealer tearing apart engine
2019 Toyota Avalon · Engine · filed with NHTSA Aug 23, 2019 · ODI 11246041
Hazard (fishtailing risk): In rain with LTA ON, small but critical driver steering corrections near center are overridden by EPS/LTA, which apply centering torque into steering dual compliance creating a real steering wheel deadband canceling the driver’s turning of the wheel across the deadband; then the steered wheels snap abruptly to…
2024 Toyota RAV4 Prime · Lane Departure · filed with NHTSA Nov 19, 2025 · ODI 11700388
The contact owns a 2021 Toyota Rav4 Hybrid. The contact stated that on two separate occasions, while driving at high rates of speed, the vehicle stalled after slamming on the brake pedal. The contact waited approximately 20-30 seconds after the initial failure before being able to restart the vehicle and resume normal driving operation.
2021 Toyota RAV4 · Electrical System · filed with NHTSA Jan 26, 2024 · ODI 11568053
In depth: 2020 Toyota Camry engine problems → · 2020 Toyota Camry electrical problems → · 2019 Toyota Camry engine problems → · 2018 Toyota Camry engine problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the service brakes
Source: same model, same component group13 other manufacturer communications filed against these Toyota models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the Toyota list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| T-SB-0022-25 REV2 | Service bulletin | Jul 1, 2026 | Some 2022 – 2026 model year Tundra, Tundra Hybrid, and 2023 – 2026 model year Sequoia Hybrid vehicles may exhibit a condition where the fron… |
| T-SB-0022-25 REV1 | Service bulletin | Nov 19, 2025 | Some 2022 – 2026 model year Tundra, Tundra Hybrid, and 2023 – 2026 model year Sequoia Hybrid vehicles may exhibit a condition where the fron… |
| T-SB-0022-25 | Service bulletin | Feb 10, 2025 | Some 2023 – 2025 model year Sequoia Hybrid, and 2022 – 2025 model year Tundra and Tundra Hybrid vehicles may exhibit a condition where the f… |
| 24TE05 | Warranty extension | Jan 30, 2025 | Although the Brake Booster and Brake Booster Pump Assemblies are covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 mile… |
| T-SB-0014-25 | Service bulletin | Jan 29, 2025 | Some 2017 – 2019 model year Highlander Hybrid vehicles may exhibit a condition in which the brake, ABS, and/or TRAC warning lights are on an… |
| T-SB-0001-22 REV2 | Service bulletin | Dec 16, 2024 | Some 2019 – 2025 model year RAV4 and RAV4 Hybrid vehicles may exhibit a squeal/squeak noise from the front brakes with light to moderate bra… |
| 24TE01 | Service campaign | Nov 4, 2024 | This Customer Support Program provides coverage as it applies to Brake Booster and Brake Booster Pump Assemblies on Certain 2014-2016 Model… |
| T-SB-0043-24 REV2 | Service bulletin | Sep 13, 2024 | Some 2023 – 2024 model year Sequoia Hybrid, and 2022 – 2024 model year Tundra and Tundra Hybrid vehicles may exhibit a condition where the f… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Toyota, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Toyota TSB010421 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the TSB010421 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Toyota warranty extension on file lists the ones Toyota has filed.
Which vehicles does TSB010421 cover?
The manufacturer filed it against 52 model years: 2022 Toyota Avalon, 2021 Toyota Avalon, 2020 Toyota Avalon, 2019 Toyota Avalon, 2024 Toyota Camry, 2023 Toyota Camry and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.