Service bulletins for the 2020 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.
1073 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| A1921262061918_4 | 2022-01-05. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides guidance on diagnosing a coolant light concern with normal coolant level in the tank. |
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| A002155201173212 | 2022-01-05. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains general instructions for software updates. |
| A9721822061976_2 | 2021-12-07. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin contains guidance for submitting warranty wiring repairs. |
| A9021272064844_1 | 2021-12-07. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This bulletin contains repair instructions for when the Audi virtual cockpit does not start-up with no DTCs. |
| A4421842065160_1 | 2021-12-07. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; TIRES:TEMPORARY/EMERGENCY SPARE TIRE. This informational bulletin explains how the temporary/collapsible spare wheel inflates. |
| A9121502062115_7 | 2021-12-07. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains instructions for when the nav files are corrupted during an update. |
| A3921452048671_5 | 2021-12-07. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains instructions for when DTC U030000 appears and “All Wheel Drive Malfunction Message” is displayed in the instrument cluster. |
| A5721862058452_3 | 2021-12-07. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW. This bulletin contains repair instructions for when the rear window defog button will light up and then turn off. |
| A4821132063528_2 | 2021-12-07. Service bulletin. ENGINE. This bulletin contains instructions for addressing intermediate shaft noises that are heard in the engine compartment. |
| A9121472061625_3 | 2021-12-07. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin states to create a PSS record when the message "SOS - Emergency call malfunction, please contact service" is displayed in the instrument cluster and DTCs B129B11 and B239C11 are stored in the control module for emergency call module and communication unit. |
| A9121422062266_3 | 2021-11-05. Service bulletin. UNKNOWN OR OTHER. This bulletin states to create a PSS record when last destinations, favorites, and home/work addresses are sporadically lost. |
| A6921722063398_2 | 2021-11-05. Service bulletin. UNKNOWN OR OTHER. This informational bulletin outlines what is damage due to outside influence on a seat belt. |
| A3421532064848_1 | 2021-11-05. Service bulletin. POWER TRAIN. This bulletin addresses an issue where basic settings cannot be performed as DTC P17F900 is stored in the TCM. |
| A0121142063394_2 | 2021-11-05. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin contains instructions for clearing DTCs P023600 and P060600. |
| A9121382064681_1 | 2021-11-05. Service bulletin. EQUIPMENT. Informational TSB detailing why the mobile device sometimes cannot be charged wirelessly. |
| A7221372064695_1 | 2021-11-05. Service bulletin. STRUCTURE; SEATS. The informational bulletin explains the technical aspect of enter/exit assistance. |
| DC 20210928 | 2021-10-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Dealer Communication - Vehicle Sales Reporting, Reinstatement, and Audit Policy Update - Effective September 30, 2021 |
| SM 70-2021 | 2021-10-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This special notice is to inform dealers to return the parts listed if it meets the criteria provided. |
| A9121342018187_1 | 2021-10-05. Service bulletin. EQUIPMENT. This bulletin contains inspection guidelines for radio interference that causes noises in the speaker. |
| A9121312061028_3 | 2021-10-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin explains and troubleshoots when Audi connect does not have a green SOS light. |
| A9121302062115_6 | 2021-10-05. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin contains instructions for when the nav files are corrupted during an update. |
| A9121262064429_1 | 2021-10-05. Service bulletin. BACK OVER PREVENTION: SENSING SYSTEM: CAMERA. This bulletin states to create a PSS record for when the star button is programmed to the front camera views and is lost after a bus sleep cycle. |
| A8721162041717_7 | 2021-10-05. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This informational bulletin details on how to get a GFF test plan for A/C compressor replacements. |
| A6921702064545_1 | 2021-10-05. Service bulletin. AIR BAGS. This bulletin contains instructions for when DTC B101C29 and/or B101D29 is stored in the airbag control module. |
| A6921692056406_2 | 2021-10-05. Service bulletin. AIR BAGS. This bulletin contains instructions for when the airbag warning is illuminated and DTC B13BCF2 is stored. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.