BMW X7 2019–2021 — technical service bulletin
Bulletin B520521 · NHTSA communication 10190855 · issued Mar 1, 2021
Technical service bulletin
communication type
Structure
component
2019–2021
model years
3
vehicle entries
Official summary
REWORK SEAT MECHANISM 2ND ROW SEAT: The mounting nuts on the rear left seat frame (60% seat, situated behind the driver's seat) were not properly tightened.
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.