Service bulletins for the 2021 Audi A4
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.
1057 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
| A9023312058077_7 | 2023-08-04. Service bulletin. SERVICE BRAKES; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. This bulletin provides information for when an unexpected Audi presense front intervention such as a front end warning, a warning jolt, partial braking, or emergency braking occurs and a warning appears in the instrument cluster and audibly. |
|---|---|
| A6423922020552_1 | 2023-08-04. Service bulletin. VISIBILITY. This bulletin provides information for when exterior glass cleaning is needed. |
| A5323082063913_5 | 2023-08-04. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin provides information for when the instrument cluster driver information system display is blank. |
| A0123622070915_1 | 2023-08-04. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides information for a loose engine oil filler cap is loose, DTCs P06800, P227900, P050700. |
| A6923922063398_3 | 2023-07-10. Service bulletin. SEAT BELTS. This bulletin provides information for when the seatbelt is hard to latch in the belt buckle. |
| A6923912056406_4 | 2023-07-10. Service bulletin. AIR BAGS. This bulletin provides information for when the airbag warning light is on and DTC B13BCF2 is stored in the airbag control module. |
| A4823502063528_4 | 2023-07-10. Service bulletin. STEERING. This bulletin provides information for when noises are heard inside the vehicle via the intermediate steering shaft. |
| A4823492061904_5 | 2023-07-10. Service bulletin. STEERING. This bulletin provides information for when the yellow steering malfunction light is on in the cluster and DTC C110DF0 is stored in the active steering module. |
| A4823452065871_3 | 2023-07-10. Service bulletin. STEERING. This bulletin provides information for when there is an active steering malfunction with DTC B200FF0. |
| A4823432055733_4 | 2023-07-10. Service bulletin. STEERING. This bulletin provides information for when there are squeaking noises from the rubber boot of the intermediate steering shaft. |
| A9123072064681_3 | 2023-07-10. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE; ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information for when wireless charging with the Audi Phone Box does not work. |
| A102326201828810 | 2023-07-10. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides information on checking for debris when replacing an engine. |
| A4623452070679_1 | 2023-07-10. Service bulletin. SERVICE BRAKES, AIR:ANTILOCK. This bulletin provides information for when one or more DC is stored in the ABS control unit related to the parking switch; DTC C100C07 and/or C100C29. |
| A4823412028220_1 | 2023-07-10. Service bulletin. STEERING: STEERING WHEEL/HANDLE BAR. This bulletin provides information for instances where the steering wheel leather is damaged. |
| A9423652061922_3 | 2023-07-10. Service bulletin. EXTERIOR LIGHTING. This bulletin provides detailed information on the proper documentation of optical concerns for headlights and taillights. |
| A9123982069112_3 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides a software update for instances where saved addresses (including the home address), favorites, last destinations, and/or icon and shortcut order are lost sporadically, the MMI screen turns blue, or becomes stuck on the welcome screen. |
| A9123052068573_2 | 2023-07-10. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS. This bulletin provides information for when the parking aid sensor bracket(s) separate from the rear bumper. |
| A9123022061257_3 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides information for when the message "Audi connect installation: error during installation" is shown in the drop down menu of the MMI. |
| A9123002070573_1 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides a software update for instances where the integrated toll module settings can no longer be accessed via the MMI, or the Audi smartphone interface can only be used wired. No relevant DTCs have been stored, and 91DZ has been performed. |
| A9023282070020_2 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This bulletin provides information for when semi circular marks appear on the edges of the virtual cockpit display. |
| A9023272063913_4 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin provides instructions for when the Driver Information System is blank. |
| A5723082027406_5 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER. This bulletin provides information regarding the Audi advanced key. |
| A5523762062730_3 | 2023-07-10. Service bulletin. STRUCTURE:BODY:TRUNK LID; STRUCTURE. This bulletin provides information for when the luggage compartment lid cannot be closed using the button(s) in the luggage compartment trim. |
| A2723562069747_3 | 2023-07-10. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides additional diagnostic instructions for when the vehicle does not start due to a drained 12v battery (A). |
| A7223472064695_2 | 2023-06-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides information on the operation of the entry/exit assistance feature. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.