P0171 Mitsubishi montero sport -

Question

My check engine light has been on for at least 8 months. Have replaced PCv valve, EGR valve solenoid and 1 sensor. P0171 and P0174 codes keep showing up. Checked for leaks and disconnected hoses.

Answer 1

Hi there,

Since you have a lean mix on both banks, check the fuel pressure and the mass air flow sensor. It's very common to have lean fuel mixture codes with a maf sensor that is reading wrong.