Audi A4 2021–2023 — technical service bulletin
Bulletin A0124072071243_1 · NHTSA communication 10249578 · issued Jan 30, 2024
Technical service bulletin
communication type
Engine
component
2021–2023
model years
15
vehicle entries
Official summary
This bulletin provides information when whistling noises are heard from the turbocharger at 1500-2200 rpm and approximately 70% load on 4 cyl 2.0 TFSI.
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.