1999 Honda Accord Coupe 5-Speed Code P0420?

JohnRybarczyk

New member
Catalyst Efficiency Below Threshold. The Catalytic Converter Has Been Gutted, The Code Is Still Being Thrown Out. After Driving For A While The Car Will Start To Sputter And Die. Im Thinking Maybe The O2 Sensors But Not Sure, Thanks For The Answers!
 
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