Audi A4 2017–2018 — technical service bulletin
Bulletin DC_91CD 20220817 · NHTSA communication 10217920 · issued Aug 17, 2022
Technical service bulletin
communication type
Equipment
component
2017–2018
model years
12
vehicle entries
Official summary
91CD Activation Percentage Improvement Support.
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.