BMW 330E 2018–2021 — technical service bulletin
Bulletin B640321 · NHTSA communication 10205096 · issued Nov 1, 2021
Technical service bulletin
communication type
Visibility
component
2018–2021
model years
16
vehicle entries
Official summary
After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less.
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.