Audi A4 2021 — technical service bulletin
Bulletin A9121332064292_1 · NHTSA communication 10201517 · issued Sep 16, 2021
Technical service bulletin
communication type
Equipment
component
2021
model years
22
vehicle entries
Official summary
This bulletin contains repair instructions for when adjusting the MMI volume via the steering wheel controls, the volume sporadically and unintentionally goes all the way to min or max.
Vehicles covered
- 2021 Audi A4
- 2021 Audi A5
- 2021 Audi A5 Cabriolet
- 2021 Audi A8
- 2021 Audi A8 L E
- 2021 Audi Allroad
- 2021 Audi E-Tron
- 2021 Audi Q3
- 2021 Audi Q5
- 2021 Audi Q5 E
- 2021 Audi Q5 PHEV
- 2021 Audi Q7
- 2021 Audi Q8
- 2021 Audi RS 5
- 2021 Audi S4
- 2021 Audi S5
- 2021 Audi S5 Cabriolet
- 2021 Audi S8
- 2021 Audi SQ5
- 2021 Audi TT
- 2021 Audi TT RS
- 2021 Audi TTS
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.