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  1. M

    '11 6.2 trouble codes P0023, P0024, P0456

    Truck runs perfectly, has no driveability issues. However, in order to pass smog check here in CA, there must be no codes present and CEL must be off. These 3 codes have been an on again off again problem for many years, even though the truck runs perfect, and has no decrease in mileage...
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