What does code P1187 mean on BMW vehicles?
The ECU detects a failure in the heater control circuit of the post-catalyst oxygen sensor (Bank 2 Sensor 2).
OBD-II Code BMW
P1187 — BMW — O2 Sensor Heater Control Circuit (Bank 2 Sensor 2)
The ECU detects a failure in the heater control circuit of the post-catalyst oxygen sensor (Bank 2 Sensor 2).
Common symptoms
- Check engine light illuminated
Possible causes
- Faulty heater element in O2 sensor
- wiring or connector issues
Initial recommendation
Check heater circuit integrity and replace sensor if required.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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