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
| A6621692030471_6 | 2021-03-04. Service bulletin. EQUIPMENT. This informational bulletin covers the condition of when license plate mounting bracket threaded inserts are stripped. |
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| A4421792022563_1 | 2021-03-04. Service bulletin. WHEELS. This bulletin provides information regarding vibrations or movement that are felt in the wheel. |
| A1721122060750_2 | 2021-03-04. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin contains instructions for using the UV additive to find engine oil leaks. |
| A9121642024323_7 | 2021-02-04. Service bulletin. PARKING BRAKE:ELECTRICAL:CONTROL MODULE. This bulletin contains technical information regarding when the parking aid sporadically warns of obstacles that don't exist or it is inoperative/constant warning. |
| A1921112061918_1 | 2021-02-04. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides guidance on diagnosing a coolant light concern with normal coolant level in the tank. |
| A6621682046229_2 | 2021-02-04. Service bulletin. STRUCTURE. This informational bulletin outlines proper warranty procedure for optical defects. |
| A0121962060429_2 | 2021-02-04. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for when there may be a noise from the exhaust flap or there are DTCs sporadically stored in the ECM. |
| A5520512014055_8 | 2021-01-08. Service bulletin. EQUIPMENT; ENGINE; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for addressing discoloration due to moisture on a new vehicle. |
| A2020322061778_1 | 2021-01-08. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE; FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS. This bulletin contains repair instructions for addressing a noise from the fuel lines. |
| A0020432061669_1 | 2021-01-08. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin contains instructions for Audi connect before performing any MMI work. |
| SM C-2020 | 2021-01-08. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the part numbers listed (State of California only). |
| A0020362002047_1 | 2020-12-21. Service bulletin. EQUIPMENT:ELECTRICAL. This information bulletin contains instructions for technicans on how to ensure their TAC call goes smoothly. |
| A9120382061397_1 | 2020-12-04. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT:BLUETOOTH/WIFI; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains repair instructions for voice recognition or Bluetooth quality issues that are related to the microphone. |
| 2010-2021EngOil | 2020-12-04. Service bulletin. EQUIPMENT. Added Saga Part number for 0W40 oil: SAGA Part: G E55040S0 |
| 21TTTECHREP | 2020-11-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Vehicle Preparation Section: REMOVED: "Verify Audi phone box customer registration form is present in vehicle and add the serial number from Elsa. See TSB 2051720" (Doesn't apply) Driver Assistance Section: ADDED: "Activate rear cross traffic assist (if equipped)" |
| 21TTCUSTDEL | 2020-11-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. REMOVED: Phone Box Form (Doesn't Apply) Infotainment Section: REMOVED: "Review Audi Phone Box Customer Form and ensure Serial Number is listed" |
| A9120242026611_7 | 2020-11-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains a guide for troubleshooting HD radio issues. |
| A4820912053869_4 | 2020-11-05. Service bulletin. STEERING:STEERING WHEEL /HANDLE BAR:HAND HEATER/COOLER. This bulletin contains repair instructions for when DTC B145504 with symptom code 7340800. |
| A1720112060750_1 | 2020-11-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION; EQUIPMENT. This bulletin contains instructions for using the UV additive to find engine oil leaks. |
| A0020422045316_5 | 2020-11-05. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING:ENGINE. This bulletin contains information for diagnosing the Start/Stop system. |
| 21TIREPRSTBL930 | 2020-10-06. Service bulletin. TIRES. Addition of RS 6 Avant |
| 21TIREPRSTBL924 | 2020-10-06. Service bulletin. TIRES. Addition of A4, S4, A4 allroad, A5, S5, RS 5, A6 allroad, S6, A8 L, A8 L TFSI e, S8 L, e-tron, Q8, SQ8, RS Q8 |
| 21AUUSMaint0920 | 2020-10-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. New Document |
| 21AUTIRECHAINS | 2020-10-06. Service bulletin. TIRES; EQUIPMENT; WHEELS. Added new graphic to reflect where to find MY 21 information |
| A9120142060675_1 | 2020-10-06. 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'. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.