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What is engine code P1404 on a 1998 Chevrolet Silverado 350?

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What is engine code P1404 on a 1998 Chevrolet Silverado 350?

Vehicle: 1998 Chevrolet Silverado 350

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More information here: https://www.autocodes.com/p1404_chevrolet.html

Before replacing any parts, try cleaning the EGR valve and/or reprogramming the ECM,

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