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p0420 code

   
Old Dec 3, 2010 | 10:34 PM
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p0420 code
All i need help my 04 is throwing a code of a p0420 and my power is not all there. What can I do to fix this. Also feels like a clunk in the rear end anyone else have this issue?
 
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Old Dec 4, 2010 | 10:25 AM
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From: Joplin MO
You probably have a plugged cat on the passenger side. Take it to a muffler shop and get it checked out.
 
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Old Jan 13, 2011 | 07:56 PM
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I have this code too. Are there two cats? How can I determine which cat it is without checking?
 
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Old Jan 13, 2011 | 10:06 PM
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I have the same code....Its passenger side cat. My power and fuel mileage are both pitiful.
 
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Old Jan 13, 2011 | 10:24 PM
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so bank 1 means the passenger side cat?
 
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Old Jan 13, 2011 | 10:31 PM
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bank 1 is passenger side (right side). p0420 means your convertor is no longer functioning. needs to be replaced. loss of power may be because the cat is plugged up. engine cant breath through restricted cats.
 
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Old Jan 13, 2011 | 10:33 PM
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so its definetly the cat though? not the O2 sensor? and can i put on a universal cat and just put pipe where this one was and still be good for inspections?
 
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Old Jan 13, 2011 | 10:41 PM
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its not the o2 sensor....The reason you got the code is because the o2's are working correctly. I just bought a pair of magnaflow 94136 im gonna put them on....They are supposed to be good in every state except CA.
 
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Old Jan 13, 2011 | 11:11 PM
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well can I put a cat in a different spot on the exhaust and thats still good for inspection
 
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Old Jan 14, 2011 | 06:00 AM
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It depends on how strict your state is. If the OBD2 checks out it should pass unless they are strict on a visual inspection. Ask your local inspection station.
 
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