BMW X1 2024 — technical service bulletin
Bulletin B120324 · NHTSA communication 11028920 · issued Feb 12, 2026
Technical service bulletin
communication type
Engine
component
2024
model years
2
vehicle entries
Official summary
The Engine Malfunction Warning is illuminated, and the following fault code is stored in the DME- FC 034AEF Exhaust Cold Start, Not Controllable
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.