BMW 540I 2016–2020 — technical service bulletin
Bulletin B011219 · NHTSA communication 10170559 · issued Dec 1, 2019
Technical service bulletin
communication type
Structure
component
2016–2020
model years
18
vehicle entries
Official summary
FRONT GRILLE UPPER/LOWER ACTIVE AIR FLAPS: LTD WTY EXT TO 15 YEARS/150000 MILES. A check engine light or check control message is present and one or more of the following faults may be stored for the active air flaps behind the kidney grilles.
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.