BMW X1 2016–2020 — technical service bulletin
Bulletin B130218 · NHTSA communication 10171485 · issued Jan 1, 2020
Technical service bulletin
communication type
Electrical System
component
2016–2020
model years
7
vehicle entries
Official summary
DME FAULT CODE 1B8004 ENVIRONMENTAL AIR CATALYST(EAC) SENSOR: This Service Information Bulletin (Revision 1) replaces SI B13 02 18 dated April 2018. The Malfunction Indicator Lamp (MIL) light is on and the following fault code is stored in the DME: 1B8004 - EAC Sensor: Temperature - Engine coolant temperature radiator outlet comparison to each other implausible DME software calibration error for EAC sensor diagnostics.
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.