Audi A4 Allroad 2017–2018 — technical service bulletin
Bulletin A911820 2052251- · NHTSA communication 10153139 · issued Nov 29, 2018
Technical service bulletin
communication type
Equipment
component
2017–2018
model years
3
vehicle entries
Official summary
This bulletin contains software update instructions for when the audio is distorted from door speakers or subwoofer.
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.