What does code P1089 mean on BMW vehicles?
The downstream oxygen sensor on bank 1 responds slowly, affecting catalyst efficiency monitoring.
OBD-II Code BMW
P1089 — BMW — Oxygen Sensor Circuit Slow Response in Lean Control Range (Bank 1 Sensor 2)
The downstream oxygen sensor on bank 1 responds slowly, affecting catalyst efficiency monitoring.
Common symptoms
- Reduced catalytic converter efficiency
Possible causes
- Faulty or aging downstream oxygen sensor
Initial recommendation
Inspect and replace post-catalyst oxygen sensor if required.
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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