Audi A4 Allroad 2017–2018 — technical service bulletin
Bulletin A911927 2053533 · NHTSA communication 10157191 · issued Jan 14, 2019
Technical service bulletin
communication type
Equipment
component
2017–2018
model years
3
vehicle entries
Official summary
This bulletin contains a software update for when the subwoofer adjustment setting is missing in the MMI, vehicles have Bang & Olufsen.
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.