OBD codes / P0174
P0174
SeriousSystem Too Lean (Bank 2)
Address promptly — can worsen or affect drivability.
Likely causes
- vacuum leak
- dirty MAF
- fuel delivery
Common fixes
- check for leaks
- clean MAF
- test fuel pressure
Seeing P0174 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0174 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.