What does code P1181 mean on BMW vehicles?
The downstream oxygen sensor on bank 2 switches too slowly from rich to lean, affecting catalyst efficiency.
OBD-II Code BMW
P1181 — BMW — Oxygen Sensor Signal Circuit Slow Switching from Rich to Lean (Bank 2 Sensor 2)
The downstream oxygen sensor on bank 2 switches too slowly from rich to lean, affecting catalyst efficiency.
Common symptoms
- Reduced catalyst efficiency
Possible causes
- Aging downstream oxygen sensor
Initial recommendation
Inspect and replace post-catalyst oxygen sensor if needed.
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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