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
| TSB_2079118_1 | 2025-09-04. Service bulletin. UNKNOWN OR OTHER. This bulletin provides tips for improving the robustness of the Bluetooth and CarPlay connection. |
|---|---|
| TSB_2073747_3 | 2025-09-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information for when there are scratches or a coating on the cover of the instrument cluster, or there are particles or insects inside of the housing. |
| TSB_2079133_1 | 2025-09-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides an MMI software update for MIB3 vehicles. |
| TSB_2042920_3 | 2025-09-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there is corrosion on the tailpipes. |
| TSB_2061976_4 | 2025-09-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information for wire harness repairs and documentation. |
| TSB_2078939_1 | 2025-09-04. Service bulletin. VISIBILITY/WIPER. This bulletin provides information when there DTC P218500 is stored in temerature sender G83. |
| TSB_2076184_2 | 2025-09-04. Service bulletin. STRUCTURE:BODY. This bulletin provides information when the front seat makes creaking/squeaking noises. |
| TSB_2075681_5 | 2025-09-04. Service bulletin. POWER TRAIN. This bulletin provides informaoitn when there is droning noises/vibrations in tight corneres, in vehicles that have quattro with ultra technology. |
| TSB_2074436_2 | 2025-09-04. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when the horn sound quality is poor. |
| TSB_2070568_5 | 2025-09-04. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information about professional noise analysis with the VAS 611 015 PICO-NVH tool |
| TSB_2078652_1 | 2025-09-04. Service bulletin. STRUCTURE:BODY. This TSB provides service information regarding noises from the sliding sunroof. |
| TSB_2061028_8 | 2025-09-04. 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_2060750_4 | 2025-09-04. Service bulletin. UNKNOWN OR OTHER. This bulleitn provides information regarding UV Leak additive for finding oil leaks. |
| AOS-25-47 | 2025-09-04. Service bulletin. UNKNOWN OR OTHER. This is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: The hotfix is to correct the issue: Issue seen: ODS5003E Infrastructure Guided Fault Finding: An internal fatal error occurred during the G929 - Vehicle Interior Carbon Dioxide Concentration Sensor function test plan. NOTE: This ODS error could show up on any other GFF function test plans as well. |
| TSB_2078728_1 | 2025-08-05. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information when a customer reports that poor voice quality via bluetooth with iOS 18.0.x - 18.4.x. |
| TSB_2078648_1 | 2025-08-05. Service bulletin. STRUCTURE:BODY. This TSB provides information related to billing regarding billing for a broken sunroof glass panel. |
| TSB_2075681_4 | 2025-08-05. Service bulletin. POWER TRAIN. This bulletin provides informaoitn when there is droning noises/vibrations in tight corneres, in vehicles that have quattro with ultra technology. |
| TSB_2075217_3 | 2025-08-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the display of guages is faulty in Audi virtual cockpit. |
| TSB_2074806_4 | 2025-08-05. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there are noises after selecting a gear while the vehicle is idling and stationary, or while driving. |
| TSB_2070568_4 | 2025-08-05. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information about professional noise analysis with the VAS 611 015 PICO-NVH tool |
| TSB_2070020_6 | 2025-08-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the Audi virtual cockpit display has semi-circular marks on edges of the display. |
| TSB_2064077_7 | 2025-08-05. Service bulletin. STRUCTURE:BODY. This bulletin provides information when the air conditioning cooling output is insufficient; leak on air conditioning system evaporator. |
| TSB_2061028_7 | 2025-08-05. 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_2060560_4 | 2025-08-05. Service bulletin. POWER TRAIN. This bulletin providesi nformation when various DTCs are stored; high maximum temperature recorded for clutch K1. |
| TSB_2027368_7 | 2025-08-05. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when the Audi advanced key is inoperative; door handle touch sensors. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.