What does code P1156 mean on BMW vehicles?
The heater circuit of the downstream oxygen sensor on bank 2 reports lower than expected voltage.
OBD-II Code BMW
P1156 — BMW — Oxygen Sensor Heater Circuit Low Voltage (Bank 2 Sensor 2)
The heater circuit of the downstream oxygen sensor on bank 2 reports lower than expected voltage.
Common symptoms
- Check engine light on
Possible causes
- Open circuit
- wiring resistance
- low supply voltage
Initial recommendation
Inspect heater circuit wiring and power supply to the sensor.
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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