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
| A4624572051095_9 | 2024-10-28. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information on frequency analysis. |
|---|---|
| A4524492075120_1 | 2024-10-28. Service bulletin. SERVICE BRAKES. This bulletin provides information regarding the general approach to brakes rubbing. |
| A4524462072304_2 | 2024-10-28. Service bulletin. ELECTRICAL SYSTEM. This bulleitn provides information when there is an implausible signal in the ABS/ESC speed sensor. |
| A4424082074846_2 | 2024-10-28. Service bulletin. STEERING. This bulletin provides information when there are vibrations and rotational steering wheel vibrations. |
| A4324972051336_8 | 2024-10-28. Service bulletin. SUSPENSION. This bulletin provides information when DTC B2200FF is stored in the J775. |
| A4324932059665_6 | 2024-10-28. Service bulletin. SUSPENSION. This bulletin provides information parameter settings for suspension control unit J775. |
| A4024812060855_2 | 2024-10-28. Service bulletin. SUSPENSION. This bulletin provides information when there are rumbling noises from the suspension - upper link rubber mounting. |
| A3924722059129_6 | 2024-10-28. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when there are noises and/or vibration in tight turns in vehicles with quattro drive. |
| A2424632074810_2 | 2024-10-28. Service bulletin. ENGINE. This bulletin provides information when ther is an Engine: start/stop system fault shown and start/stop system not is working; mileage below 50 km/32 miles. |
| A1924672075348_1 | 2024-10-28. Service bulletin. POWER TRAIN. This bulletin provides information pertaining to the cooling system; radiator fan control P048000/P048100. |
| A0024932002047_13 | 2024-10-28. Service bulletin. UNKNOWN OR OTHER. This bulletin provides guidance in order to provid informaiton regarding preparatoin when calling the Audi Technical Assistnce Center (TAC). |
| A0024922031473_5 | 2024-10-28. Service bulletin. STRUCTURE:BODY. This bulletin provides informationw hen there are car was brush bristles trapped in the seam between the headlight and fender. |
| A9324042074808_1 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides service-info relating to lithium-ion high-voltage batteries; determining energy content. |
| A9224402065963_3 | 2024-09-06. Service bulletin. VISIBILITY/WIPER. This bulletin provides information on repairing the corrugated hose for the windshield washer system. |
| A9124462068573_3 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informationw hen the parking aid sensor bracket(s) separates from the rear bumper. |
| A9124452059528_12 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when there is an eCall fault / the eCall LED is red with DTC B200000. |
| A9124392074855_1 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the calendar function is not available in MIB3. |
| A9124372060523_3 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides software update instructions for MIB3. |
| A9024252074975_1 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informaion when there power and torque always display always shows 0% in the Audi virtual cockpit. |
| A9024192048926_10 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when there are various messages displayed; DTCs B200FF1 and/or B200FF2 stored in the camera control module. |
| A9024182064983_9 | 2024-09-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informaion when the Audi virtual cockpit displays a colorful line (pixel error). |
| A6024732063187_6 | 2024-09-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information for checking the seal of the panoramic sunroomf due to wind noises or leaks. |
| A4424062074846_1 | 2024-09-06. Service bulletin. WHEELS. This bulletin provides information vibrations and rotational steering wheel vibrations. |
| A4424052074843_1 | 2024-09-06. Service bulletin. WHEELS. This bulletin provides information when there is a wheel/tire imbalance. |
| A3924702059057_11 | 2024-09-06. Service bulletin. POWER TRAIN. This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.