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Old 06-07-2012, 07:14 PM
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o2 code po420

I own a 1999 Jeep Grand Cherokee limited with a 4.7l V8 . I am planning on using Antifowlers to get rid of the code. Does anyone know the size of the Antifowlers I would need to plug my o2 sensor into?????? Please Advise.
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Old 06-07-2012, 07:53 PM
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Re: o2 code po420

Sorry, no answer on your question, but why do you have the code to start with? Did you remove the cats or are they not working properly?
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Old 06-09-2012, 01:41 AM
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Re: o2 code po420

Last time i had P0420 code it was my Cat that was shot... I would hook up a scanner and a check the o2 sensor readings first. Here is a link to the code.
http://www.obd-codes.com/p0420
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