Audi A3 2017–2021 — technical service bulletin
Bulletin A3421522062540_1 · NHTSA communication 10189143 · issued Mar 10, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2021
model years
7
vehicle entries
Official summary
This bulletin contains instructions for diagnosing and addressing a leak.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.