system too lean

Question

hello i have trailblazer 2006 everytime i refuel the car i get the code p0171 for 2-3 days they say there is no relation between them but i dont know its just Happens

Answer 1

Hi there,

If anything refueling the car should cause a rich mix code, not a lean code. The lean code is a result of an intake manifold leak, an exhaust leak, low fuel pressure, bad mass air flow sensor or a problem with the rear O2 sensor. It shouldn't be related to filling the car at all.