1999 Honda Accord Coupe 5-Speed Code P0420?

  • Thread starter Thread starter John Rybarczyk
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John Rybarczyk

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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!
 
Your car has an O2 sensor on the catalytic converter that is connected to the engine management computer. When the sensor or the catalytic converter fails, you will get this trouble code. Replace the catalytic converter and the O2 sensor.
 
The 420 code is being thrown because the cat isn't doing it's job. Replace the converter and have the code reset. How can the the o2 sensors monitor a gutted cat?
 
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