WenmarOpen by Wenmar Pro

Service bulletins for the 2021 Audi TT

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.

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

By type

By component

By trouble code

Bulletins, newest first
A4821092028220_92021-09-03. Service bulletin. EQUIPMENT. This technical service bulletin informs the reader that damage to the appearance of the leather steering wheel caused by outside influence is not covered under warranty.
A9121202051720_42021-09-03. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin contains instructions for submitting a customer registration form for the Audi phone box to the customer's Mobile Network Operator.
A4821082063526_12021-09-03. Service bulletin. SERVICE BRAKES. This bulletin contains instructions for when DTC B116831 is stored in the ABS module with several warning lamps.
A4421832056386_62021-09-02. Service bulletin. STEERING: STEERING WHEEL/HANDLE BAR; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for when the vehicle pulls to one side or the steering wheel is crooked.
A4221462038689_52021-09-02. Service bulletin. 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.
A1921222046712_32021-08-04. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP. This informational bulletin contains guidelines for figuring out why coolant marks are present around the coolant expansion tank cap.
21AUUSMaint7212021-08-04. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Additional Maintenance Items: Rear axle, quattro Sport - Change ATF and differential oil. CHANGED "Change Fluids". Every 60,000 miles - Only: RS 5, S6, S7, SQ7, SQ8, RS Q8. Oil Capacity Chart: Changed Q7 45 TFSI 2.0L oil type to "508".
A9121142053916_32021-08-04. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. This informational bulletin contains instructions for when a non-plus sized iPhone heats up while wirelessly charging and the CarPlay screen may appear frozen.
A1921192061918_32021-07-02. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides guidance on diagnosing a coolant light concern with normal coolant level in the tank.
A0021482021205_62021-07-02. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; STRUCTURE. This informational bulletin explains how to order replacement VIN plates, Safety Certification Labels, etc.
A0021472031473_32021-07-02. Service bulletin. EXTERIOR LIGHTING:HEADLIGHTS:CONCEALMENT DEVICES; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; STRUCTURE. This information bulletin states to remove the car wash bristle and advise the customer to go somewhere else to prevent it from occurring again.
Dealer 24GQ2021-07-02. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE. In the event of a catalytic converter failure, which could negatively impact tailpipe emissions, existing diagnostics may not properly illuminate the malfunction indicator light (MIL).
Circular 24GQ2021-07-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); EQUIPMENT. In the event of a catalytic converter failure, which could negatively impact tailpipe emissions, existing diagnostics may not properly illuminate the malfunction indicator light (MIL).
A9421392063739_12021-07-02. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS. This information bulletin explains how the daylights turn on and off.
A4821062063153_22021-07-02. Service bulletin. STEERING:STEERING CONTROL MODULE. This bulletin states to delete the DTC and release the vehicle if DTC C10AC07 is stored in the power steering control module with one of the following symptom codes 24320, 24321, 24322, 24323, 24324, or 24325.
SM 44-20212021-07-02. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the parts listed if it meets the criteria provided.
21TechRefGde5262021-06-03. Service bulletin. BACK OVER PREVENTION; TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). All models except Q3, R8, and TT: Settings Section: Split Verify and set language & measurements checklist items into 2 separate with instructions. Changed instructions for "Set Entertainment Fad in Parking aid", " Set Music volune while parking to Medium", and "Turn off Manual Seed Warning". Media/Radio/Sat Section: Changed instructions for "Verify HD Radio is turned "off". On-Hoist Inspection Section: Changed where to store tire pressures for Set and store tirepressures" to "Home > Vehicle > Settings & Service > Tire pressure monitoring". Audi connect Section: Changed instructions for "Turn on the Wi-Fi hotspot", Check Wi-Fi hotspot visibility", and Enable satellite map view for navigation"
A9121042024323_82021-06-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SOFTWARE. This bulletin contains technical information regarding when the parking aid sporadically warns of obstacles that don't exist or it is inoperative/constant warning.
A6921662063398_12021-06-03. Service bulletin. SEAT BELTS. This informational bulletin outlines what is damage due to outside influence on a seat belt.
A9021032058077_52021-06-03. Service bulletin. EQUIPMENT; SERVICE BRAKES. This bulletin contains instructions for determining unexpected Audi presense interventions.
A1021222018288_92021-06-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. This technical service bulletin reminds the reader to check for metal debris when replacing an engine.
A0021442052680_32021-06-03. Service bulletin. EQUIPMENT. This bulletin contains instructions for additional reporting requirements for safety related inquiries (airbag/seatbelts, accidents, fire and overheat damage).
A8721132010146_12021-06-03. Service bulletin. STRUCTURE. This bulletin contains instructions for properly cleaning and removing a musty odor in the vehicle.
A6421802020552_12021-06-03. Service bulletin. VISIBILITY:GLASS, SIDE/REAR. This bulletin provides instructions on how to clean exterior glass.
A4421822056386_52021-06-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY:VEHICLE CONTROLS:STEERING. This bulletin contains instructions for when the vehicle pulls to one side or the steering wheel is crooked.

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