What does code P1157 mean on BMW vehicles?
The heater circuit of the downstream oxygen sensor on bank 2 reports excessively high voltage.
OBD-II Code BMW
P1157 — BMW — Oxygen Sensor Heater Circuit High Voltage (Bank 2 Sensor 2)
The heater circuit of the downstream oxygen sensor on bank 2 reports excessively high voltage.
Common symptoms
- Check engine light on
Possible causes
- Short circuit
- damaged wiring
Initial recommendation
Inspect heater circuit wiring and repair short circuits.
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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