2005 STS v8 engine check light (code: P0420 & P0430)
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Cadillac STS Forum - 2005 through 2012 Discussion, 2005 STS v8 engine check light (code: P0420 & P0430) in Past Cadillac Vehicle Discussion; cats has been removed, using spark fools but seem not to get that message out of my way .. any ...
  1. #1
    mrcoollv is offline Cadillac Owners Member
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    2005 STS v8 engine check light (code: P0420 & P0430)

    cats has been removed, using spark fools but seem not to get that message out of my way ..

    any thoughts ?

    P0420 BANK1
    P0430 BANK2

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  3. #2
    curtc's Avatar
    curtc is offline Cadillac Owners Master
    Automobile(s): 2006 STS V8 1SF RWD
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    Re: 2005 STS v8 engine check light (code: P0420 & P0430)

    Only other option if you can't get the foulers to work is to re-tune the PCM to not care about the cats being gone. Not sure if the 05 is tuneable though. Reach out to Northstar Performance, Jake would be your best bet for questions like that.

  4. #3
    Too Fast is offline Cadillac Owners Member
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    Re: 2005 STS v8 engine check light (code: P0420 & P0430)

    Yes you will have to get that tuned out.

  5. #4
    mrcoollv is offline Cadillac Owners Member
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    Re: 2005 STS v8 engine check light (code: P0420 & P0430)

    ah ok, i was going to try this https://www.youtube.com/watch?v=n-upYHEQu0w but if it can be tuned out then woot

  6. #5
    mrcoollv is offline Cadillac Owners Member
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    Re: 2005 STS v8 engine check light (code: P0420 & P0430)

    question, is there a tunner like madtunner or something that will allow me to do this?

  7. #6
    curtc's Avatar
    curtc is offline Cadillac Owners Master
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    Re: 2005 STS v8 engine check light (code: P0420 & P0430)

    As I previously recommended, check with Jake at Northstar Performance, he'd be able to tell you.
    Too Fast likes this.

  8. #7
    mrcoollv is offline Cadillac Owners Member
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    Re: 2005 STS v8 engine check light (code: P0420 & P0430)

    Quote Originally Posted by curtc View Post
    As I previously recommended, check with Jake at Northstar Performance, he'd be able to tell you.
    hello, i have no answer from him even gave him the link to this thread..

    is ok, i ordered an tuner for the 05 so i can tuneout myself the codes

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