I got the engine codes P0171 and P0300 came on the same time

Question

I got the engine codes P0171 and P0300 came ON at the same time on my 2007 Chevrolet HHR 2.4L

Answer 1

Hi there,

P0171 is a lean fuel mixture issue. Common causes would be intake manifold leak, faulty mass air flow sensor or low fuel pressure by a failing fuel pump. If the mixture is to lean this will cause the P0300 multiple misfire code, so start by checking or trying to diagnose the lean condition first.