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Service bulletin T-SB-0104-21

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10206528
Published by NHTSA2022-01-18
Manufacturer's numberT-SB-0104-21
Manufacturer's date2021-12-17
NHTSA componentELECTRICAL SYSTEM; EQUIPMENT; ENGINE

NHTSA's summary

TSB: Some 2018 ? 2022 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, or M20A-FKS 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]). 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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine, Equipment and accessories

Trouble codes named

P0520, P0524

Vehicles listed
TOYOTA AVALON2019, 2020, 2021, 2022
TOYOTA AVALON HYBRID2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA CAMRY2018, 2019, 2020, 2021, 2022
TOYOTA CAMRY HYBRID2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA COROLLA2020, 2021, 2022
TOYOTA COROLLA HATCHBACK2019, 2020, 2021 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA HIGHLANDER2020, 2021, 2022
TOYOTA HIGHLANDER HYBRID2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA RAV42019, 2020, 2021, 2022
TOYOTA RAV4 HYBRID2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA RAV4 PRIME2021 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA SIENNA HYBRID2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA VENZA HYBRID2021, 2022 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
25V8770002025-12-17. EQUIPMENT ADAPTIVE/MOBILITY:WHEELCHAIR RESTRAINTS/SECUREMENT:LATCH/ANCHOR:
20233822023-07-12. Electrical
23V4780002023-07-12. ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER
23V0410002023-02-02. ELECTRICAL SYSTEM:PROPULSION SYSTEM:HYBRID MANAGEMENT:POWER CONTROL UNIT/MODULE (HPCU)
22V3100002022-05-06. EQUIPMENT:OTHER:LABELS
20217232021-11-24. Electrical
20201492020-04-08. Electrical
20V1620002020-03-19. ENGINE; FUEL SYSTEM, GASOLINE:DELIVERY
20200392020-02-06. Engine
20V0640002020-02-06. ENGINE AND ENGINE COOLING

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
T-SB-0110-20 Rev22026-09-09. Service bulletin. OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T-SB-0051-26.
T-SB-0051-262026-09-09. Service bulletin. This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries.
26TC032026-09-09. Service campaign. TECHNICAL INSTRUCTIONS FOR EMISSION NONCOMPLIANCE RECALL 26TC03 Certain 2022 – 2025 Model Year RAV4 Incorrect Mass Air Flow Sensor Reading
26TC032026-09-09. Service campaign. In wet conditions, water contacting the radiator in the subject vehicles after idling for an extended period can create steam that can cause an incorrect engine sensor reading. This can lead to a warning light, a rough-running engine, or a potential engine stall while idling or operating at low speeds.
24TE042026-09-09. Warranty extension. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
26TC032026-08-12. Service bulletin. TECHNICAL INSTRUCTIONS FOR EMISSION NONCOMPLIANCE RECALL 26TC03 Certain 2022 – 2025 Model Year RAV4 Incorrect Mass Air Flow Sensor Reading
26TC032026-08-12. Service bulletin. TECHNICAL INSTRUCTIONS FOR EMISSION NONCOMPLIANCE RECALL 26TC03 Certain 2022 – 2025 Model Year RAV4 Incorrect Mass Air Flow Sensor Reading
26TC032026-08-12. Service campaign. In wet conditions, water contacting the radiator in the subject vehicles after idling for an extended period can create steam that can cause an incorrect engine sensor reading. This can lead to a warning light, a rough-running engine, or a potential engine stall while idling or operating at low speeds.
22TE092026-06-04. Warranty extension. Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing extended coverage under this Customer Support Program for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator. Excessive corrosion can cause AM Radio Static during certain drive cycles, or the vehicle may not start.
T-SB-0023-262026-05-08. Service bulletin. Some customers may experience a rough running engine with a MIL ON P140018 DTC. Upon further inspection, a loose C90/C27 connector pin at the EGR valve may be found. To correct this concern, please reference the repair section of this TSB.