P0171 and P0174 What to Look For

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If you are suffering a P0171 or P0174 I'm going to go over some very simple checks that will most likely lead to solving the issue. P0171 and P0174 are usually related to Unmetered air entering the engine while it's running. This unmetered air can get it past the Mass air flow sensor, can be a leaking throttle body or intake, exhaust leak, intake gaskets, this can also be due to poor fuel delivery to the engine. symptoms of this can be plugged fuel filter, weak fuel pump, restriction or blockage in the fuel line.

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