BMW 1 Series 2007–2018 — technical service bulletin
Bulletin B540907 · NHTSA communication 10143557 · issued May 1, 2018
Technical service bulletin
communication type
Structure
component
2007–2018
model years
17
vehicle entries
Official summary
Retractable hardtop status request supplement
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.