P0171 on a 2012 chevy sonic just started today.

Question

P0171 on a 2012 chevy sonic ls just started today.

Answer 1

Hi there,

There could be several causes for this code.

Common causes are intake manifold leaks, faulty mass air flow sensor, bad rear O2 sensor or low fuel pressure. The most common would be the intake leak or maf sensor. I would check these in this order to determine the cause of the concernt. Any of these can cause a lean fuel mixture.