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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.

By type

By component

By trouble code

By topic

Bulletins, newest first
A6620672060333_22020-11-05. Service bulletin. EQUIPMENT; STRUCTURE:BODY. This bulletin contains instructions for when the black optic trim is discolored.
A9620572060826_12020-11-05. Service bulletin. EQUIPMENT; FORWARD COLLISION AVOIDANCE: SENSING SYSTEM: CAMERA; ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains calibration information for the front camera.
A9020732059891_32020-11-05. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This informational bulletin directs you to read the SSP and not perform any repairs for the concern.
A1720112060750_12020-11-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION; EQUIPMENT. This bulletin contains instructions for using the UV additive to find engine oil leaks.
A1520352053278_42020-11-05. Service bulletin. ENGINE; STRUCTURE:BODY. This bulletin contains repair instructions for 3.0 and 2.9 TFSI engines that have oil loss around the engine compartment, front end, and underbody.
A0020422045316_52020-11-05. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING:ENGINE. This bulletin contains information for diagnosing the Start/Stop system.
21AUTIRECHAINS2020-10-06. Service bulletin. TIRES; EQUIPMENT; WHEELS. Added new graphic to reflect where to find MY 21 information
A9120142060675_12020-10-06. Service bulletin. STRUCTURE; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:WARNING; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS; EQUIPMENT:ELECTRICAL. This bulletin contains instructions for addressing the issue when the parking assist will intermittently alert the customer to an obstruction and the sensors look 'pushed in'.
A9120112037809_72020-10-06. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This informational bulletin contains instructions about updating the navigation map.
A9020682059891_22020-10-06. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This informational bulletin directs you to read the SSP and not perform any repairs for the concern.
A0120832060429_12020-09-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This bulletin contains instructions for when there may be a noise from the exhaust flap or there are DTCs sporadically stored in the ECM.
A0120822058767_62020-09-03. Service bulletin. ENGINE; EQUIPMENT. This bulletin contains instructions for DTCs P218100, P017B00, P308100, and P01E400.
A9120922053916_22020-09-03. Service bulletin. ELECTRICAL SYSTEM. This informational bulletin contains instructions for when a non-plus sized iPhone heats up while wirelessly charging and the CarPlay screen may appear frozen.
A6920562059223_22020-09-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains information regarding the replacement of PODs components.
A0120762054893_32020-09-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. This bulletin contains instructions for documenting the "Please reduce Oil Level" message in the instrument cluster potentially with an Engine Warmup request.
2010-2021EngOil2020-09-03. Service bulletin. ENGINE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. New document
Audi Part Labels2020-09-03. Service bulletin. EQUIPMENT. Recall Reminder Part Labels
A6620662060333_12020-09-03. Service bulletin. STRUCTURE. This bulletin contains instructions for when the black optic trim is discolored.
A4020132059474_22020-08-06. Service bulletin. SUSPENSION:FRONT:SHOCK ABSORBER; EQUIPMENT. This bulletin contains instructions for correcting buffer stop noise (rumbling or squeaking from the front end).
A3920342060169_12020-08-06. Service bulletin. EQUIPMENT; POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. This bulletin contains instructions for when DTC U101300 is logged with sports differential warning lamps or messages.
A1920042025303_12020-07-07. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin contains instructions for identifying and mixing factory fill coolants.
A9020512058077_42020-07-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains instructions for determining unexpected Audi pre sense interventions.
A0120652058767_52020-07-07. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. This bulletin contains instructions for DTCs P218100, P017B00, P308100, and P01E400.
A0020382039206_32020-07-07. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This informational bulletin contains instructions on how to use the QR code in a TSB.
A9120702044694_22020-06-04. Service bulletin. EQUIPMENT. This technical service bulletin provides troubleshooting for issues with the navigation map database.

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