# Service bulletin A3421522062540\_1

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.

- Type: Service bulletin
- NHTSA id: 10189143
- Published by NHTSA: 2021\-04\-06
- Manufacturer's number: A3421522062540\_1
- Manufacturer's date: 2021\-03\-10
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

This bulletin contains instructions for diagnosing and addressing a leak.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189143-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189143-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2017 to 2020 AUDI A3
- 2019 to 2021 AUDI TT

## Recalls for the same vehicles and component

- [2017397](/recalls/tc/2017397.md), 2017-08-16: Engine

## Other bulletins for the same vehicles and component

- [TSB\_2082323\_1](/bulletins/11034728.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides informaiton when the engine is not running smoothly, misfiring.
- [TSB\_2074640\_3](/bulletins/11034657.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides information when there is increased oil consumption; \>0.5ltr/1000 km.
- [TSB\_2073867\_3](/bulletins/11034656.md), 2026-07-07, Service bulletin: ENGINE. This bulletin provides information when DTC U140A00 Terminal 30 is stored in the ECM.
- [TSB\_2051095\_10](/bulletins/11029368.md), 2026-03-03, Service bulletin: ENGINE. This bulletin provides information on the use of the Audi frequencly analysis app, and where the application can be downloaded.
- [TSB\_2021205\_10](/bulletins/11029367.md), 2026-03-03, Service bulletin: ENGINE. This bulletin provides information on VIN Plates, Safety Certification labels, and the ordering procedures.
- [TSB\_2060750\_5](/bulletins/11028398.md), 2026-02-06, Service bulletin: ENGINE. This bulletin provides information regarding UV leak additive for finding oil leaks.
- [TSB\_2074640\_2](/bulletins/11027356.md), 2026-01-07, Service bulletin: ENGINE. This bulletin provides information when there is increased oil consumption; \>0.5ltr/1000 km.
- [TSB\_2073867\_2](/bulletins/11018973.md), 2025-06-03, Service bulletin: ENGINE. This bulletin provides information when DTC U14A00 Terminal 30 is stored in the ECM.
- [TSB\_2075530\_2](/bulletins/11016532.md), 2025-04-04, Service bulletin: ENGINE. This bulletin provides informatin when the engine does not run smoothly at idling speeds.
- [A0124482014753\_13](/bulletins/11012476.md), 2025-01-07, Service bulletin: ENGINE. This bulletin provides information when the MIL is on; DTCs for misfire, air/fuel ratio imbalance, or lean fuel system stored in the ECM P030000.

JSON: [/v1/bulletins/10189143](/v1/bulletins/10189143)

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