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99 Silverado service code p0420


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Posted

Just got this truck and the guy I got it off of said it had this code because of a hole in the exhaust. Replaced the exhaust from cat back and still have the code even after resetting the code. I've heard it is most likely the cats. Anyone ever run into this?

Posted

Just got this truck and the guy I got it off of said it had this code because of a hole in the exhaust. Replaced the exhaust from cat back and still have the code even after resetting the code. I've heard it is most likely the cats. Anyone ever run into this?

Left side cat is toasted. Replace and it will be rectified

 

 

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