BMW X1 2016 — technical service bulletin
Bulletin B130218 · NHTSA communication 10138383 · issued Apr 1, 2018
Technical service bulletin
communication type
Engine and Engine Cooling
component
2016
model years
2
vehicle entries
Official summary
DME FAULT CODE 1B8004 ENVIRONMENTAL AIR CATALYST (EAC) SENSOR: During a service or vehicle test, the DME has the following fault code stored but the Malfunction Indicator Lamp (MIL) light is not illuminated:
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.