P0171 code what is the fix?

Question

Hi  I have cleaned MAS and replaced fuel cap. disconected neg battery cable. light went out. drove for 50 miles light stayed out. went out next morning and as soon as i started it the check engine light came back on. help please.

Answer 1

Hi there

Intake manifold leaks on bank 1, or a bad front O2 sensor can cause this code. I would begin checking for intake leaks since the issue is only on bank 1. This could also be a low fuel pressure issue.