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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.

By type

By component

By trouble code

By topic

Bulletins, newest first
A6420722047061_22020-05-07. Service bulletin. STRUCTURE. This bulletin contains a cleaning procedure from leftover residue from suction cups or labels.
A4320322051336_22020-05-07. Service bulletin. SUSPENSION. This bulletin contains repair instructions for DTC B200FF0.
A0120542014753112020-05-07. Service bulletin. FUEL SYSTEM, GASOLINE. This bulletin contains instructions for when to add gasoline additives for cleaning the injectors.
A5120132009967_12020-04-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for vehicle inspection, protection removal, and detailing.
A3920282059057_12020-04-02. Service bulletin. UNKNOWN OR OTHER. This bulletin contains repair instructions for noises when in reverse or vibrations/humming/droning or rubbing whrn fully turning the wheel.
A3420472058875_12020-04-02. Service bulletin. UNKNOWN OR OTHER. This bulletin contains instructions for oil leaking from the vehicle without a DTC.
A0120512057831_22020-04-02. Service bulletin. UNKNOWN OR OTHER. This bulletin contains repair instructions for DTC P201500 which may or may not have a MIL on.
A9420202017806132020-04-02. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains information regarding when the message 'Vehicle lights: malfunction' appears with DTC 03280, 01800, or B126AF0.
A3920272051558_22020-04-02. Service bulletin. 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.
A3920262048671_42020-04-02. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains instructions for when DTC U030000 appears and 'All Wheel Drive Malfunction Message' is displayed in the instrument cluster.
A3420462058928_12020-04-02. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL). This bulletin contains instructions for recalibrating the gear sensor when the 'P' displays begin to flicker on the selector display and in the instrument cluster display.
A0120502058890_12020-04-02. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains instructions for replacing a part or performing a software update for DTC P000000.
A4820852053869_32020-04-02. Service bulletin. STEERING. This bulletin contains repair instructions for when DTC B145504 with symptom code 7340800. 48 Steering wheel heater is not working, DTC B145504 is stored in the steering column control module.
A0120482058767_12020-04-02. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. This bulletin contains instructions for DTCs P218100, P017B00, P308100, and P01E400.
A0120462014753102020-04-02. Service bulletin. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS. This bulletin contains instructions for when to add gasoline additives for cleaning the injectors.
SM 14-20202020-04-02. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the parts listed and order the superseded part number going forward
A9120392018187112020-03-05. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. This bulletin contains inspection guidelines for radio interference that causes noises in the speaker.
A9120372057052_22020-03-05. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin contains instructions for when the MMI shows the message 'Read error occurred when accessing the navigation data' after initialization and reboots constantly with DTC B126CF0 and/or B126CF1.
A8720032055257_52020-03-05. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This bulletin contains repair instructions for when the HVAC system is having issues with air flow and temperature commands with DTCs B11AF07 and B109207.
A4420732056386_32020-03-05. Service bulletin. STEERING: STEERING WHEEL/HANDLE BAR. This bulletin contains instructions for when the vehicle pulls to one side or the steering wheel is crooked.
18AUUSMaint02202020-03-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. OIL CHART SECTION: CHANGED - Castrol Oil to 'Audi approved XXXX-Refer to the Parts Catalog' for all models.
A9120342042506_92020-03-05. Service bulletin. EQUIPMENT. 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.
A4220422058459_12020-03-05. Service bulletin. SUSPENSION:REAR:SHOCK ABSORBER. This bulletin contains instructions when there is creaking noises from the rear of the vehicle from one of the shock absorber mountings.
18AUUSMaint01302020-02-08. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Additional Maintenance Section: ADDED to Battery - Connected gateway 'for Audi Connected Services' (if applicable)
SM 01-20202020-02-08. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This special notice is to inform dealers to return all parts listed and only use the superseded part numbers going forward.

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