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P0171 code on Mazda 6

I have a Mazda 6 with 3.0 liter engine. Engine light came on week ago checked with code reader it goes up P0171 and P0174. Took off MAF sensor clean it clear code. When I drive over an hour engine light comes back on with same code. Let car sit at least 8 hours engine light turns off. Drive it for an hour engine light turns back on. Car runs fine no problems with performance of car. Need up with this problem.

Vehicle: 2003 Mazda 6 engine size 3.0 liter
asked Sep 20, 2013 by Daniel

1 Answer

P0171 Fuel trim (RH) too lean

P0174 Fuel trim (LH) too lean

Lean condition , check the MAF air duct, this duct has a tendency to tear especailly at the bottom part going to the throttle body, You are also going to have to check fuel pressure the specification are 63psi-73 psi
answered Sep 20, 2013 by Reynaldo (6,598 points)

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