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Service bulletins for the 2020 Audi S4

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.

942 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
20A4TECHREP4202020-05-07. Service bulletin. ELECTRICAL SYSTEM. Audi connect Section: Moved to end of document. Post-Road Test Section: ADDED Steps: - Verify SOS button is green and Roadside assistance button LED will remain off - It may take up to 20 minutes for the emergency call system to activate (LED turns green) after flight/transport mode deactivation - The vehicle must not be delivered to the customer if the emergency call function has not been successfully activated (LED lights up in green)
20AUUSMaint02202020-03-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Standard Maintenance Section: Connected Battery Box: ADDED: SQ7, SQ8 Additional Maintenance Items section: Fragrance Cartridges: ADDED: SQ7, SQ8 Rear axle, quattro® Sport - Change ATF and differential oil: ADDED: SQ7, SQ8 Spark plugs - Replace every 30,000 miles: ADDED: SQ7, SQ8 OIL CAPACITY CHART: ADDED: SQ7, SQ8 CHANGED: Castrol Oil to 'Audi High Performance Genuine Engine Oil'
20AUUSMaint01302020-02-08. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Standard Maintenance Items section: ADDED to Connected box battery '(for Audi Connected Services)'
20A4TECHREP12192020-01-08. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. "Vehicle Preparation Section: ADDED additional steps to Perform TSB 2058096/1 "91 Audi connect has no function, SOS LED is off, and SOS warning message in FPK"": - Perform MMI Menu Reset: 5F-Information Electronics >> Guided Functions >> Basic Settings >> Reset MMI Menu Settings - Deactivate privacy mode: Main Menu >> Privacy >> Activate Privacy Settings (Turn off) - Turn Vehicle Off and allow Bus Sleep Cycle "
20A4S4ALRDTECREP2020-01-08. Service bulletin. ELECTRICAL SYSTEM. Vehicle Preparation Section: ADDED: "Perform TSB 2058096/1 '91 Audi connect has no function, SOS LED is off, and SOS warning message in FPK'" 2020 A4 allroad
A0019252011732_12019-10-21. Service bulletin. ELECTRICAL SYSTEM. 00 Software Version Management (SVM), operating instructions
A9119932037087_42019-10-15. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains instructions for enabling text message notifications through the MMI system.

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