Service bulletins for the 2021 Audi A4 allroad
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.
785 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
| A2023622069834_2 | 2023-12-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This repair authorization requests that technicians contact the Technical Assistance Center before proceeding when the MIL is illuminated, and DTC P04F000 is stored. |
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| A9123432071056_2 | 2023-12-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides information for when Outlook contacts are not accessible via the MMI when using Apple devices with MIB3. |
| A3423642067653_4 | 2023-12-06. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides instructions for when "Gearbox Malfunction" and/or vehicle does not shift up or down, and/or vehicle is in limp mode home, and/or "reverse gear is unavailable" displayed in the instrument cluster, and/or "You can continue driving (functions limited" with DTCs P071800 and/or P276800 and possible in combination with DTC P081100 and/or P081E00. |
| A0023812070568_2 | 2023-12-06. Service bulletin. EQUIPMENT. This bulletin provides information on the VAS 611 015 PICO-NVH tool for professional noise analysis. |
| A9623882064285_2 | 2023-11-06. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin provides information for when the button for the rear dome light is stuck or inoperative. |
| A9623872061932_6 | 2023-11-06. Service bulletin. LANE DEPARTURE: LANE KEEP: STEERING ASSIST. This bulletin provides information for when the message "Audi Active Lane Assist/Traffic Jam Assist: malfunction". |
| A9423672071954_1 | 2023-11-06. Service bulletin. EXTERIOR LIGHTING:TAIL LIGHTS; EXTERIOR LIGHTING:HEADLIGHTS. This bulletin provides information pertaining to when there are foreign objects inside of a headlight or taillight. |
| A9123402071928_1 | 2023-11-06. Service bulletin. BACK OVER PREVENTION:DISPLAY FUNCTION; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides information for when the MMI sidebar is missing in MIB3. |
| A9023482071920_1 | 2023-11-06. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin advises that it is normal that certain navigation instructions are not displayed on the HUD. |
| A9023452064983_6 | 2023-11-06. Service bulletin. EQUIPMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides information for when the Virtual cockpit displays a colorful line (pixel error). |
| A8723602064077_3 | 2023-11-06. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REFRIGERANT HOSES AND FITTINGS. This TSB describes a method for leak detection for R134A and R1234yf refrigerant platforms only. |
| A7423262071893_1 | 2023-11-06. Service bulletin. EQUIPMENT:OTHER:LABELS. This bulletin provides damage assessment guidelines for textile seat covers. |
| A6623032060333_4 | 2023-11-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information for when the black optic trim is discolored. |
| A2723612067906_4 | 2023-11-06. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This bulletin provides information for when DTC P0A7D00 is stored. |
| A0123812028842_4 | 2023-11-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides instructions regarding unauthorized chip tuning (TD1). |
| A0023782066297_4 | 2023-11-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information related to the VIN-4-PIN Program. |
| A0023762071721_1 | 2023-11-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information for when unauthorized/unjustified DTC memory entries are captured in ODIS test Plans (Ghost faults). |
| A9223372056963_2 | 2023-11-06. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER. This bulletin provides information on repairing the corrugated hose for the windshield washer system. |
| A6023682063187_4 | 2023-11-06. Service bulletin. VISIBILITY:SUN/MOON ROOF ASSEMBLY. This bulletin provides information for when the outer perimeter seal is loose on the panoramic sunroof opening. |
| A3923562059057_6 | 2023-11-06. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides information for when there are vibrations or binding in tight turns with quattro Ultra. |
| A0023752066297_3 | 2023-11-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides details on the VIN-4-PIN program. |
| A0023742052680_4 | 2023-11-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides information on the additional reporting requirements for safety related inquiries. |
| A912330206211511 | 2023-10-05. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin provides information on reinstalling the navigation database when DTC B126CF0 and/or B126CF1 is stored in the 005F. |
| A6423942070094_2 | 2023-10-05. Service bulletin. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS. This bulletin provides information for when the rear window reverses direction at upper stop. DTC: B148754 stored in door module. |
| A4623522054385_3 | 2023-10-05. Service bulletin. SERVICE BRAKES. This bulletin provides information for when the brakes creak at an almost standstill. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.