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Service bulletins for the 2021 Audi S4

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.

969 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
A8724952041717_122025-01-07. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when a GFF test plan required for A/C compressor replacements regardless of concern.
A8724932076287_12025-01-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the control functions in the vehicle are restricted.
A7224612076184_12025-01-07. Service bulletin. STRUCTURE:BODY. This bulletin provides information when the front seat makes creaking/squeaking noises.
A6624152046229_52025-01-07. Service bulletin. STRUCTURE:BODY. This bulletin provides informationw hen there are optical defects, scratches, and/or chrome peeling.
A5124322068999_32025-01-07. Service bulletin. STRUCTURE:BODY. This TSB provides information when there is cracked paintwork with corrosion at joint between roof and roof side member.
A4424092056386_102025-01-07. Service bulletin. WHEELS. This bulletin provides information regarding wheel alignment.
A4324012067531_62025-01-07. Service bulletin. SUSPENSION. This bulletin provides information when DTCs B200FF0 to B200FF5 stored in the J775 suspension control unit.
A3924762075681_22025-01-07. Service bulletin. POWER TRAIN. This bulettin provides information when droning noises/vibrations in tight corners is reported.
A2724842074729_22025-01-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information in circumstances where there are noises/vibration from front of vehicle in dynamic mode.
A0124482014753_132025-01-07. Service bulletin. ENGINE. This bulletin provides information when the MIL is on; DTCs for misfire, air/fuel ratio imbalance, or lean fuel system stored in the ECM P030000.
A0024012076404_12025-01-07. Service bulletin. UNKNOWN OR OTHER. This TSB provides a deployment overview for customer service packages, MLB, and MQB for MIB3/connectivity box/OCU3/LSR.
A9624092076008_12024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the camera for the Driver Assist Systems is coded incorrectly.
A9624072056019_32024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the anti-theft alarm activates for no reason, or when the anti-theft alarm does not activate.
A9624062075891_12024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when various camera-based driver assistance systems are unavailable (DTC B200FF2 (1123875)).
A9324342074808_22024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides service-info relating to lithium-ion high-voltage batteries; determining energy content.
A9124872024323_112024-12-04. Service bulletin. ELECTRICAL SYSTEM. This TSB Provides information when parking assistance provides false warnings.
A9124842018187_172024-12-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information when speaker rattles, vibrations, or audio interference is noted.
A9124782075537_22024-12-04. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when DTCs U142100 and U164200 are stored as passive/sporadic in the gateway.
A9024472059891_82024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the restricted function icon for Audi Pre sense is displayed after engine starts.
A9024432059863_42024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informatoin when Audi pre sense restricted message appears in the instrument cluster, no DTCs.
A6424022020552_132024-12-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information regarding cleaning exterior glass.
A5024152062633_32024-12-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information when creaking noises are heard when body twists during braking or steering maneuvers.
A4324002067531_52024-12-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the DTCs B200FF0 to B200FF5 are stored in the J775 suspension control unit.
A0024992070568_32024-12-04. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information about professional noise analysis with the VAS 611 015 PICO-NVH tool
A0024982075515_22024-12-04. Service bulletin. FUEL/PROPULSION SYSTEM. This bulletin advises that fuel additives are not permitted.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.