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2013 Chevey SilveradoHD with 6.6 Duramax code PO420

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Truck runs fine but this code just started 2 weeks ago
Vehicle: 2013 Chevy Silverado Duramax 6.6 diesel

1 Answer

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Hi there,

This code means the bank 1 catalytic converter is not working as well as it should. This could be the result of a bad O2 sensor or an exhaust leak

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