Audi A4 Allroad 2017–2019 — technical service bulletin
Bulletin A9119782052251_3 · NHTSA communication 10164224 · issued Aug 14, 2019
Technical service bulletin
communication type
Equipment
component
2017–2019
model years
7
vehicle entries
Official summary
This bulletin contains software update instructions for when the audio is distorted from door speakers or subwoofer. 2017-2019 A4 2018-2019 A5, A5 Cabriolet, and A5 Sportback
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.