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
| SM 40-2024 | 2024-08-06. Other. ELECTRICAL SYSTEM. This special notice is to inform dealers to return the parts listed if it meets the criteria provided. |
|---|---|
| SM 39-2024 | 2024-08-06. Other. ENGINE. This special notice is to inform dealers to return the parts listed if it meets the criteria provided. |
| A9624002061932_8 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides infrmation when the message "Audi Ative Lane Assist/Traffic Jam assist: malfunction!", DTC U112300 is stored. |
| A9124342072959_2 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when Apple CarPlay pops up or takes over audio without user intervention. |
| A9124322018187_16 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informaiton when there are speaker rattles, vibrations or audio interference in the sound system. |
| A9124302059528_11 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the ecall LED is red/ecall Fault, with DTC B200000. |
| A9024172059891_7 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the restricted function icon for Audi pre sense is displayed after the engine starts. |
| A9024142064844_4 | 2024-08-06. Service bulletin. ENGINE. This bulletin provides information when the Audi virtual cockpit remains blank at startup. |
| A8724812064077_5 | 2024-08-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information when the air conditioning cooling output is insufficient; leak on air conditioning system evaporator. |
| A8724792067716_2 | 2024-08-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information when the air conditioning does not cool. |
| A8224002041717_10 | 2024-08-06. Service bulletin. VISIBILITY/WIPER. This bulletin provides informatin for the GFF test plan that is requied for AC compressor replacements. |
| A7224572074721_1 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information about noises from the backrest of the front seat. |
| A7224562064695_4 | 2024-08-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there is an entry/exit assistance comfort concern. |
| A5724532027368_6 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the door handle touch sensors (Audi advanced key) inoperative. |
| A5524992070966_3 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information for when the customer requests that the gesture-controlled rear lid be deactived. |
| A4824682028220_11 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there is visual damage on the steering wheel. |
| A4324922067531_4 | 2024-08-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the DTCs B200FF0 to B200FF5 are stored in the J775 suspension control unit. |
| A3924652059057_10 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides informatino when there are vibrations or binding in tight turns with quattro Ultra. |
| A3924642074618_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are vibration or binding in tight turns with quattro Ultra. |
| A3924632059057_9 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are vibrations or binding in tight turns. |
| A3724212074822_1 | 2024-08-06. Service bulletin. UNKNOWN OR OTHER. This bulletin provides service information pertaining to noises from wheel input shaft/drive shaft. |
| A3724142074751_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information about replacing the clutch end cover. |
| A3724132074750_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information about replacing the clutch end cover. |
| A3424702074731_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when DTC U041300 Battery Energy Control Module "B" is stored in ECM and/or Electric Drive Control Unit |
| A2724762074729_1 | 2024-08-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there are noises/vibration from the front of the vehicle while in dynamic mode. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.