BMW X1 2016–2018 — technical service bulletin
Bulletin B121319 · NHTSA communication 10161551 · issued May 1, 2019
Technical service bulletin
communication type
Engine and Engine Cooling
component
2016–2018
model years
3
vehicle entries
Official summary
SERVICE ACTION: LOCK THE DME FAULT MEMORY (F39 F48). The fault memory lock in Digital Motor Electronics (DME) control unit was not activated. An activated lock would prevent the manual deletion of permanent fault codes. The DME fault memory lock has not been set.
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.