P1091 BMW Possible Causes
- Low fuel pressure
- Large vacuum leak in the engine
- Faulty mass air flow (MAF) sensor
- Faulty ignition
- Faulty fuel injector
How to Fix BMW P1091 Code?
Start by checking the “possible causes” listed above. Visually inspect the wiring harness and corresponding connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Check engine light on (or service engine soon warning light)
P1091 BMW Meaning
Pre-catalyst fuel mixture too rich, bank 1 is the generic description for BMW P1091 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the BMW P1091 OBDII code.