What does code P1186 mean on BMW vehicles?
The ECU detects a malfunction in the heater control circuit of the post-catalyst oxygen sensor (Bank 1 Sensor 2).
OBD-II Code BMW
P1186 — BMW — O2 Sensor Heater Control Circuit (Bank 1 Sensor 2)
The ECU detects a malfunction in the heater control circuit of the post-catalyst oxygen sensor (Bank 1 Sensor 2).
Common symptoms
- Check engine light illuminated
Possible causes
- Defective O2 sensor heater element
- open or shorted heater circuit
- wiring damage
Initial recommendation
Inspect heater circuit, wiring, and replace oxygen sensor if heater failure is confirmed.
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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