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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.

By type

By component

By trouble code

Bulletins, newest first
TSB_2062633_72026-04-07. Service bulletin. STRUCTURE:BODY. This bulleitn provides informaiotn when there are cracking/craking noises during load changes, or sever vehicle body torsion.
TSB_2061932_112026-04-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informaiton when traffic jam assist is unavailable/active lane assist fault is reported in the instrument cluster.
TSB_2059528_182026-04-07. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when the Emergency call SOS light has a fault, LED red; DTC B200000.
TSB_2051095_112026-04-07. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information about where to download the Audi frequency app.
TSB_2024323_132026-04-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the parking assistance gives false warnings.
TSB_2024323_122026-04-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the parking assistance gives false warnings.
TSB_2023187_82026-04-07. Service bulletin. SUSPENSION. This bulletin provides informaiotn regarding squeaking noises when steering or maneuvering.
DC_Audi_CF_ Airbag2026-04-07. Other. AIR BAGS. The National Highway Traffic Safety Administration (NHTSA) has issued an urgent warning regarding counterfeit replacement airbag inflators that are being installed in used vehicles.
TSB_2080517_22026-03-03. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides informaiotn when the starter battery is discharged or defective.
TSB_2079214_32026-03-03. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information regarding fault finding and repair information for electric tailgate.
TSB_2079133_42026-03-03. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides a osftware update for vehicles with MIB3, NAR Version ST37+LSR).
TSB_2067558_22026-03-03. Service bulletin. STRUCTURE:BODY. Thisb ulleitn provides informaiton when there are noises when the exterior mirrors fold in/out.
TSB_2062633_62026-03-03. Service bulletin. SUSPENSION. Thisbulleitn provides informaiotn when there are cracking/craking noises during load changes, or sever vehicle body torsion.
TSB_2059335_62026-03-03. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when there are noises from the area around the instrument cluster.
TSB_2052680_42026-03-03. Service bulletin. UNKNOWN OR OTHER. This Reporting Obligation requires technicains to contact the Technical Assistance Center (TAC) in cases where the airbag/seatbelt is deployed/not deployed; general accident information; and fire and overheat damage.
TSB_2051095_102026-03-03. Service bulletin. ENGINE. This bulletin provides information on the use of the Audi frequencly analysis app, and where the application can be downloaded.
TSB_2021205_102026-03-03. Service bulletin. ENGINE. This bulletin provides information on VIN Plates, Safety Certification labels, and the ordering procedures.
TSB_2061028_92026-02-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when there are no services in the MMI and the SOS LED does not turn green after PDI.
TSB_2080681_12026-02-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information regarding contact checks for event memories, intermittent.
TSB_2079214_22026-02-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information regarding fault finding and repair information for electric tailgate.
TSB_2067716_32026-02-06. Service bulletin. VISIBILITY/WIPER. This bulletin provides information when the air conditioner is not working, or has a restricted function; leak at the O-ring.
TSB_2059057_132026-02-06. Service bulletin. POWER TRAIN. This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra.
TSB_2076404_62026-02-06. Service bulletin. UNKNOWN OR OTHER. This bulletin provides a deployment overview for customer service packages MLB and MQB for MIB3/connectivity box/OCU3/LSR.
TSB_2074846_42026-02-06. Service bulletin. STEERING. This bulletin provides information about vibrations and rotational steering vibrations.
TSB_2069416_22026-02-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information for when the 12V socket and/or the cigarette lighter are not working.

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