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Engine Knocking Sound - Code P0327 or P0332 - Test and Fix - 1A Auto
p0404 and p0420 - Chevrolet Forum - Chevy Enthusiasts Forums
I have a PO449, PO440, PO131 any help would be great
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Q&A: Chevy Silverado O2 Sensor Locations & P0420 Code | JustAnswer
P0420 Chevy Silverado OBDII Code Diagnosis and Explanation | Drivetrain
WHAT CAUSES CODE P0420 ENGINE LIGHT CHEVROLET, CHEVY, GMC, BUICK