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Service bulletins for the 2018 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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
A3920352051558_42020-09-03. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This bulletin contains repair instructions for when the message "four-wheel drive malfunction" shows up sporadically in the instrument cluster with DTC C05ED00.
A9120952055591_32020-09-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains a software update for when the MMI screens go blank and the system reboots, it may have stored DTC U10CF00 and/or B13B901.
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
A9120902060346_12020-09-03. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains instructions for creating a PSS record when the satellite map setting is lost.
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.
A1020192059446_22020-08-06. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:PIPES, HOSES, AND FITTINGS. This bulletin contains repair instructions for oil loss found in the engine compartment.
A1920042025303_12020-07-07. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin contains instructions for identifying and mixing factory fill coolants.
A9120812052251_42020-07-07. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin contains software update instructions for when the audio is distorted from door speakers or subwoofer.
A9020512058077_42020-07-07. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains instructions for determining unexpected Audi pre sense interventions.
A9120762042506102020-07-07. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL. This technical service bulletin explains how to determine the status of activation keys (that affect the function of Audi drive select, cruise control, navigation, Bluetooth, smartphone interface and voice recognition), and how to update them.
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.
A9120652036576_62020-06-04. Service bulletin. EQUIPMENT. This informational bulletin contains instructions for when a phone is connected to the vehicle via Bluetooth, one of the following conditions occurs when the user searches for a contact name in the MMI address book (by using the MMI control knob or the voice recognition system): *The MMI screen goes blank then restarts. *The MMI screen freezes for a few minutes then recovers.
A6920522059428_12020-06-04. Service bulletin. SEAT BELTS; AIR BAGS. This bulletin contains instructions for DTCs B130494 and B130594.
A6420742020552_92020-06-04. Service bulletin. VISIBILITY:WINDSHIELD; EQUIPMENT. This bulletin provides instructions on how to clean exterior glass.
A0120632058767_42020-06-04. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for DTCs P218100, P017B00, P308100, and P01E400.
A4220442038689_42020-06-04. Service bulletin. EQUIPMENT; SUSPENSION. This bulletin contains information on how to fix a clunking or rattling noise heard from the rear suspension when the vehicle is driven over bumps.
TT 91 18 062020-06-04. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Apple car play function.
A4020062059474_12020-06-04. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; SUSPENSION. This bulletin contains instructions for correcting buffer stop noise (rumbling or squeaking from the front end).
A4020052024318_92020-06-04. Service bulletin. EQUIPMENT; WHEELS. This technical service bulletin provides instructions for correcting a clicking sound from the wheel bearing(s).

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