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Service bulletins for the 2018 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.

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

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By component

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Only bulletins with component: Equipment and accessories are shown. Show all

Bulletins, newest first
A9120412060681_22021-01-08. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This bulletin contains instructions to update eligible cars from Google Earth to the new service provided by HERE.
A5320042043016_22021-01-08. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM: CABLES; EQUIPMENT. This bulletin contains repair instructions for when cables are hanging in view with no DTCs.
A5520512014055_82021-01-08. Service bulletin. EQUIPMENT; ENGINE; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for addressing discoloration due to moisture on a new vehicle.
A0020432061669_12021-01-08. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin contains instructions for Audi connect before performing any MMI work.
SM 67-20202021-01-08. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the part numbers listed and order the superseded part numbers
A3920392051558_52021-01-08. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains repair instructions for when the message "four-wheel drive malfunction" shows up sporadically in the instrument cluster with DTC C05ED00.
SM C-20202021-01-08. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the part numbers listed (State of California only).
A9120502047576_52021-01-07. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); ELECTRICAL SYSTEM:SOFTWARE. This informational bulletin contains software instructions for vehicles with MIB2 with Navigation plus.
A0020362002047_12020-12-21. Service bulletin. EQUIPMENT:ELECTRICAL. This information bulletin contains instructions for technicans on how to ensure their TAC call goes smoothly.
A4620192061331_12020-12-04. Service bulletin. SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for addressing an ABS warning light with DTCs C050200 and/or C050800.
A4620182061403_12020-12-04. Service bulletin. SERVICE BRAKES, AIR:DISC:PADS; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for addressing a brake pad wear indicator light with no DTCs.
A3920362059057_22020-12-04. Service bulletin. STEERING; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains repair instructions for noises when in reverse or vibrations/humming/droning or rubbing when fully turning the wheel.
A9120332055591_42020-12-04. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM; EQUIPMENT. 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.
A9120312053028_42020-12-04. Service bulletin. EQUIPMENT; BACK OVER PREVENTION: CAMERA SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains a software update for when the reversing camera switches from camera view to graphic view intermittently.
A3020302053597_52020-12-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains repair instructions for when there is a leak from the lower bellhousing.
2010-2021EngOil2020-12-04. Service bulletin. EQUIPMENT. Added Saga Part number for 0W40 oil: SAGA Part: G E55040S0
A1020202059446_32020-11-05. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. This bulletin contains repair instructions for oil loss found in the engine compartment.
A9120242026611_72020-11-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains a guide for troubleshooting HD radio issues.
A9020772048926_92020-11-05. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains repair instructions for DTC B200FF1 and B200FF2.
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.
A4020142060855_12020-11-05. Service bulletin. SUSPENSION; EQUIPMENT. This bulletin contain repair instructions for rumbling noises from the suspension - upper link rubber mounting.
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.
A0120912058890_32020-11-05. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for replacing a part or performing a software update for DTC P000000.

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