BMW 640I 2012–2017 — technical service bulletin
Bulletin B520719 · NHTSA communication 10163043 · issued Jun 1, 2019
Technical service bulletin
communication type
Seats
component
2012–2017
model years
20
vehicle entries
Official summary
Noise from the front seats when adjusting the seat length.
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.