How do I fix code P0171?

To fix P0171, you may need to replace: MAF sensor, fuel injectors, fuel pump. Medium severity — get checked soon.

P0171: System Too Lean (Bank 1)

Common causes of P0171 include: Vacuum leak, Dirty MAF sensor, Weak fuel pump.

The air/fuel mixture on Bank 1 is too lean. Commonly caused by a vacuum leak, dirty MAF sensor, or weak fuel pump.

Common parts needed: MAF sensor, fuel injectors, fuel pump.