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P0420 code!

This is a discussion on P0420 code! within the General Help forums, part of the LSx Technical Help Section category; My Car's "Service Engine Soon" light came on today so I barrowed a friend's OBD-II code reader. It's throwing a ...

  1. #1
    Aw shucks. bluefields88's Avatar
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    P0420 code!

    My Car's "Service Engine Soon" light came on today so I barrowed a friend's OBD-II code reader. It's throwing a P0420 code, which I think is for the O2 sensors having different readings. I know that there was a voluntary GM recall on the cats on the cars, do you guys think that is the problem or did my O2 sensor take a dump on me? I wasn't driving it hard or anything when it came on. The engine was at 2000 RPM when it came on.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    Aw shucks. bluefields88's Avatar
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    is my car under warranty still do you think?? it only has 72K on it.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    post your VIN number and I'll let you know.

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    Aw shucks. bluefields88's Avatar
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    2g1fp22g7y2135720

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    Moderator Cutlass's Avatar
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    well unfortunately the GMVIS doesn't list the "Delivery Date" for your VIN so I can't tell you for sure. You're right at that 10 year expiration though so depending on when your car was delivered when it was new, it could be in or out of warranty.
    But your VIN does fall in the VIN breaks for the special policy and so does your mileage. So the only thing that could disqualify you would time.

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    Moderator Cutlass's Avatar
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    Looks like all of the warranty work that was done to the car was done at PARADISE CHEVROLET in TEMECULA, CA so maybe you should call them and see if its still under the Cat converter Special Policy.

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    Aw shucks. bluefields88's Avatar
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    My car was made in December of 99 so I'm guessing it's all done. :/

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    Senior Member 98maro's Avatar
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    My car has the same problem
    When it had 114k miles gm had to replace one of the cats
    I was told by the previous owner
    That was 18 months ago
    He had 1 year warranty on the cay
    And now it has 120k miles
    And the same cat is messed up again
    The warranty is over

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    Aw shucks. bluefields88's Avatar
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    So, let's say it is my cat, and I just got my car smogged. If I'm too lazy to replace the cat will it mess up my car?

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    Senior Member 98maro's Avatar
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    I dnt think it will messed up your car.
    It could make a noyse inside the cat that's it
    Mine does it. I hate it

    How did you passed your smog if you need a new cat?

  12. #12
    Aw shucks. bluefields88's Avatar
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    Quote Originally Posted by 98maro View Post
    I dnt think it will messed up your car.
    It could make a noyse inside the cat that's it
    Mine does it. I hate it

    How did you passed your smog if you need a new cat?
    I did smog a while ago. I'm good for over a year until i need it smogged again.

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    Senior Member 98maro's Avatar
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    Ohh ok
    I tought u had it done recently

    So you need the o2 sensor too?

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    Aw shucks. bluefields88's Avatar
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    No idea. I'll find out tomorrow when i go to the dealer with it.

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    Senior Member 98maro's Avatar
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    Let us knw wat it is cuz I had da same code on my car

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by bluefields88 View Post
    My car was made in December of 99 so I'm guessing it's all done. :/
    The warranty doesn't start until the day it is sold

    Quote Originally Posted by bluefields88 View Post
    So, let's say it is my cat, and I just got my car smogged. If I'm too lazy to replace the cat will it mess up my car?
    Nope...unless the cat starts clogging up. Then the engine will run like crap
    Last edited by Cutlass; 07-08-2010 at 06:44 PM.

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    Aw shucks. bluefields88's Avatar
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    Quote Originally Posted by Cutlass View Post
    I warranty doesn't start until the day it is sold



    Nope...unless the cat starts clogging up. Then the engine will run like crap
    Looked through the paper work. Car was sold on January 25th 2000.

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    Moderator Cutlass's Avatar
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    yep, then you are out of warranty by about 6 months and a week

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    Aw shucks. bluefields88's Avatar
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    Quote Originally Posted by Cutlass View Post
    yep, then you are out of warranty by about 6 months and a week
    Looks like I'm getting an offroad y-pipe. haha

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    Veteran 0rion's Avatar
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    take all the paperwork along with the special bulletin number and a sack full of cheesburgers to the dealership just before lunchtime.

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