07 Pontiac G6 codes 171 & 174. What should I check?

Question

My car runs good, gets good mileage, temp stays steady but check engine light is on and code are po171 and po 174. What should I check for?

Answer 1

HI there,

Most of the time when you have lean codes for both banks it's a result of a faulty mass air flow sensor. It may also indicate low fuel pressure as well.