BMW 330E 2018–2021 — technical service bulletin
Bulletin B640321 · NHTSA communication 10200243 · issued Jun 1, 2021
Technical service bulletin
communication type
Structure
component
2018–2021
model years
13
vehicle entries
Official summary
After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less. This leads to perceived lower cooling power. The customer may also notice that external odors enter the vehicle.
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.