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
Only bulletins with component: Exhaust and emissions are shown. Show all
| Dealer 24GQ | 2021-07-02. 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). |
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| A0120832060429_1 | 2020-09-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This bulletin contains instructions for when there may be a noise from the exhaust flap or there are DTCs sporadically stored in the ECM. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.