TSB B520121 — BMW Service bulletin
B520121 is a service bulletin on file with NHTSA for the BMW X5, 2014–2018 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. ?The front seat will not calibrate/initialize, and the stored faults cannot be deleted.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years B520121 names
Every document filed under B520121
| Document ID | Filed | Type |
|---|---|---|
| B520121 | August 1, 2023 | Service bulletin |
What B520121 covers
Seats & interior — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB B520121?
B520121 is a service bulletin filed with NHTSA by BMW, covering the BMW X5 across the 2014–2018 model years. NHTSA's summary reads: ?The front seat will not calibrate/initialize, and the stored faults cannot be deleted.
Which vehicles does B520121 cover?
NHTSA's file names BMW X5 (2014–2018). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB B520121 a recall, and is the repair free?
No. B520121 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of B520121?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under B520121, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under B520121. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.