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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
Vehicle: chevrolet trailblazer 2006
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1 Answer

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.
answered by (8.9k points)

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