P0174 System Too Lean (Bank 2)
Bank 2 is running lean. If P0171 is also present, look for a common cause such as a vacuum leak or fuel delivery problem.
Common causes
- Vacuum leak
- Dirty MAF sensor
- Low fuel pressure
- Intake gasket leak on bank 2
Symptoms
- Check engine light
- Hesitation
- Rough idle
What to check
- Compare trims on both banks
- Smoke-test the intake
- Measure fuel pressure
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0174, follow the service information for that make and model.