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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.

Warranty extensions
AWA 24-042024-06-25. FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. Diagnosed and confirmed malfunction of the vehicle’s AEB system that resulted from failure or malfunction of the AEB system’s control unit, camera(s), LIDAR, and/or sensor(s) which enable automatic emergency braking functionality.
AWA 24-042024-06-25. FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. Diagnosed and confirmed malfunction of the vehicle’s AEB system that resulted from failure or malfunction of the AEB system’s control unit, camera(s), LIDAR, and/or sensor(s) which enable automatic emergency braking functionality.

A warranty extension may pay for a repair after the basic warranty has ended. Read the document for which vehicles and which repair it covers.

By type

By component

By trouble code

Bulletins, newest first
TSB_2083409_12026-10-05. Service bulletin. UNKNOWN OR OTHER. This bulletin states that technicians are required to report to the manufacturer when a vehicle has flooded, and specify the height to which the vehicle has been flooded.
TSB_2083393_12026-10-05. Service bulletin. ENGINE. This bulletin provides information when the starter/generator drive belt is noisy or came off.
TSB_2079214_42026-10-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information regarding fault finding and repair information for electric tailgate.
TSB_2078648_42026-10-05. Service bulletin. STRUCTURE:BODY. This bulletin provides information about billing for a broken sunroof glass panel.
TSB_2074846_52026-10-05. Service bulletin. STEERING. This bulletin provides information about vibrations and rotational steering vibrations.
TSB_2073860_22026-10-05. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there are stails/marks on the sill panel trim.
TSB_2068999_52026-10-05. Service bulletin. STRUCTURE:BODY. This TSB describes a corrosion issue due to outside influence and the prohibition of warranty in these cases.
TSB_2068573_62026-10-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the rear parking sensor sometimes does not work, rear parking sensor loose, rear parking sensor fault message.
TSB_2065871_42026-10-05. Service bulletin. STEERING. This bulletin provides informaiton when DTC B200FF0 is stored.
TSB_2052680_22026-10-05. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information for reporting safety related information to the manufacturer.
TSB_2051095_122026-10-05. Service bulletin. UNKNOWN OR OTHER. This bulletin provides infomraiton abou the Audi frequency analysis application, which is available in the App Store for Android and Apple phones.
TSB_2030471_92026-10-05. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when the license plate mounting bracket threded inserts are stripped.
TSB_2020552_152026-10-05. Service bulletin. VISIBILITY/WIPER. This bulletin provides service information regarding exterior glass cleaning.
TSB_2082977_12026-09-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informaiton when the airbag warning lamp is active, event memory "B200000 - Faulty control module, symptom 305".
TSB_2082976_22026-09-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides general information about the current tpp issues for Audi connect.
TSB_2082976_12026-09-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides general information about the current tpp issues for Audi connect.
TSB_2079732_22026-09-04. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when there is a paint issue on alloy wheels.
TSB_2079696_22026-09-04. Service bulletin. UNKNOWN OR OTHER. A particularly noticeable factor is the vibration of the air column in a tire. When a tire starts to vibrate because of the road contact, this can lead to cavity resonances inside the tire that are transmitted via the wheel rim and the running gear to the vehicle interior. Because of the vehicle design and due to the specific properties of different wheel and tire combinations, a whining noise can occur at high speeds. This is a result of toroidal resonance whose frequency is noticeable between 180 - 250 Hz irrespective of the vehicle speed.
TSB_2078648_32026-09-04. Service bulletin. STRUCTURE:BODY. This service information TSB provides warranty coverage information for vehicles with a broken sunroof panel.
TSB_2076945_22026-09-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information about leather care and seat repair.
TSB_2075120_32026-09-04. Service bulletin. SERVICE BRAKES. This bulletin provides information about the general approach for brake vibration concerns.
TSB_2074843_32026-09-04. Service bulletin. WHEELS. This bulletin provides information when there is a wheel/tire imbalance.
TSB_2074436_32026-09-04. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when the horn sound quality is poor.
TSB_20741717_152026-09-04. Service bulletin. VISIBILITY/WIPER. This bulletin provides information on the GFF test plan required for AC compressor replacements regardless of the concern.
TSB_2072304_42026-09-04. Service bulletin. SERVICE BRAKES. This bulletin provides information when there is an ABS/ESC speed sensor implausible signal.

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