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Old 11-04-2008, 01:52 PM   #1
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Exclamation code p0420?

My 2002 ssei has a p0420. i was told i need a new cat. has anyone run in to this problem
and can i run a high output cat or an empty cat? thanks
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Old 11-04-2008, 02:21 PM   #2
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Sounds like your cat is not working right, or your rear O2 is not working right. If you go no cat you will get a a code. Was your cat changed recently?
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Old 11-04-2008, 03:16 PM   #3
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I just got the car i dont know
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Old 11-04-2008, 03:20 PM   #4
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Can't say for sure, but I believe that code comes up with a non standard Cat is used. There are others that would know more about that then me. That'* not a problem with my year. I seem to remember something about 00+ being funny about cats.
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Old 11-06-2008, 04:41 PM   #5
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You can replace the cat, or cut it off and gain 5-10 WHP but then your car is not street legal and install a 02 simulator for $42 and never see the check engine light on again for cat issues!!



O2 Simulator, GM 4 Wire (1996-2003)

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Old 11-07-2008, 12:31 AM   #6
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I just got this same code not a week ago! Looking into it more i found that the government requires GM to hold an 8 year 80K mile warranty on the entire pollution control system. Take it into the dealership if you HAVE NOT changed your pcm to intense'* pcm and have them replace it under warranty. Luckly i still had my old computer to swap in there before i took mine in. Also are you noticing that your boost gauge is running higher then it usually does? Mine was semi-restricted when i took it in. It would run at about 3 PSI of boost just to stay up at 65 MPH on the interstate.
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Old 11-07-2008, 11:27 AM   #7
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how do i get that simulator?
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Old 11-07-2008, 12:26 PM   #8
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If i tell you, then i have to charge you!! Just kidding... Here is the link on how to buy one... Rear O2 Emulator: 3800 Performance <---------------- Click here
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Old 11-07-2008, 04:04 PM   #9
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I had the same code and it WAS the cat. I have 73k miles on my Bonne and The cat Was covered under Warrenty. As a matter of fact... The Dealership replaced the ENTIRE Exhaust from Cat to Tips because in 02 it'* a one piece system.) Cost me $0.00 If u had to purchase the same exhaust NEW from GM it'* almost $1,000.00

Good Luck
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Old 11-07-2008, 07:26 PM   #10
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thanks!!
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