BMW 640I 2012–2017 — technical service bulletin
Bulletin B521519 · NHTSA communication 10168001 · issued Oct 1, 2019
Technical service bulletin
communication type
Seats
component
2012–2017
model years
20
vehicle entries
Official summary
FRONT SEAT HAS SIDE TO SIDE PLAY AND CAN MAKE NOISES WHEN CORNERING. Either or both of the front seats has side to side (lateral) play, and can make noises when cornering.
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.