BMW X3 2018–2021 — technical service bulletin
Bulletin B640121 · NHTSA communication 10212524 · issued Feb 1, 2022
Technical service bulletin
communication type
Engine
component
2018–2021
model years
7
vehicle entries
Official summary
A whistling noise is present from the fresh air inlet area (engine compartment bulkhead area), in the right front area of the vehicle, at speeds above 40 mph. The noise is loudest when the sunroof is in the vent position.
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.