What does code P1091 mean on BMW vehicles?
The fuel trim before the catalytic converter on bank 1 is excessively rich.
OBD-II Code BMW
P1091 — BMW — Pre-Catalyst Fuel Trim Too Rich (Bank 1)
The fuel trim before the catalytic converter on bank 1 is excessively rich.
Common symptoms
- High fuel consumption
- possible fuel odor
Possible causes
- Faulty or leaking injector
- incorrect fuel pressure
Initial recommendation
Inspect fuel injectors and verify fuel pressure and trims.
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.
Analyze this code with MecaOBD
Use the app to combine BMW code P1091 with your vehicle's actual symptoms for more complete diagnostic guidance.
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