Audi A4 2015–2019 — technical service bulletin
Bulletin A9121942051613_3 · NHTSA communication 10191569 · issued Apr 29, 2021
Technical service bulletin
communication type
Equipment
component
2015–2019
model years
22
vehicle entries
Official summary
This bulletin contains a software update and repair instructions for when the customer states that phone calls are not possible or there are no online service available.
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.