What does code P1133 mean on BMW vehicles?
A malfunction is detected in the heater control circuit of the upstream oxygen sensor on bank 2.
OBD-II Code BMW
P1133 — BMW — Oxygen Sensor Heater Control Circuit (Bank 2 Sensor 1)
A malfunction is detected in the heater control circuit of the upstream oxygen sensor on bank 2.
Common symptoms
- Check engine light on
Possible causes
- Faulty oxygen sensor heater
- wiring issue
Initial recommendation
Inspect oxygen sensor heater circuit and replace sensor if faulty.
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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