Rep.aced Cat on 2007 SRX still have P420
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, Rep.aced Cat on 2007 SRX still have P420 in Cadillac SRX Forums; My mechanic replaced what seemed like a new cat on the driver side. We also had a monitoriing of the ...
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    frankcottnj is offline Cadillac Owners Member
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    Rep.aced Cat on 2007 SRX still have P420

    My mechanic replaced what seemed like a new cat on the driver side. We also had a monitoriing of the evap system. Now the P420 came back. Took car to Cadillac dealerthey said cat was leaking and this was sending a "lean mode". I guess I should first address the leaking gasket (I don't hear a leak but what the heck). I think the problem could be a leak in intake because last time when I repaced plugs I had that bank of the intak misaligned and I torqued down the intake. Any feedback here?
    Frank 3.6L SRX 2007

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    Cadillac Cust Svc's Avatar
    Cadillac Cust Svc is offline Cadillac Customer Service
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    Re: Rep.aced Cat on 2007 SRX still have P420

    Quote Originally Posted by frankcottnj View Post
    My mechanic replaced what seemed like a new cat on the driver side. We also had a monitoriing of the evap system. Now the P420 came back. Took car to Cadillac dealerthey said cat was leaking and this was sending a "lean mode". I guess I should first address the leaking gasket (I don't hear a leak but what the heck). I think the problem could be a leak in intake because last time when I repaced plugs I had that bank of the intak misaligned and I torqued down the intake. Any feedback here?
    Frank 3.6L SRX 2007
    Hello frankcottnj,

    I am sorry to hear that you are still having an issue with your catalytic convertor after you had your mechanic replace it. I am glad to hear that the dealership was able to locate the issue that you are currently experiencing. I apologize, but I do not have any technical advice I could offer, due to the fact that I am not an engineer or a technician, but if you would like any assistance working with your dealership, please feel free to send me a private message. Please keep us updated, I will be looking for your future updates. Thank you very much for your time.

    Gregory W.
    Cadillac Customer Care

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    glake89's Avatar
    glake89 is offline Cadillac Owners Connoisseur
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    Re: Rep.aced Cat on 2007 SRX still have P420

    Frank, code 420 is for bank 1 cat. That's the PASSENGER side!
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    DougC..'s Avatar
    DougC.. is offline Cadillac Owners Member
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    Re: Rep.aced Cat on 2007 SRX still have P420

    it should be free under the extended warranty from Cadillac. 200,000 or 12 years on catalytic converters. Got both of mine replaced for free.

  6. #5
    frankcottnj is offline Cadillac Owners Member
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    Re: Rep.aced Cat on 2007 SRX still have P420

    Well I replaced bank 2 (it was a p430 not 420) cat with a walker and 400 miles later the same code p430 came up. Dealer said that the exhast flange was leaking to fix that first then see if code comes back. Well I fixed the flange and did all 02 sensors and I still get cat efficiency. I also noticed the car had a GM fairly new cat that I swapped out for the Walker. So both the new Walker and fairly new GM cat both failed. Dealer said care has no mechanical issues. Also check this out, the first new 02 sensor I put in gave a code 2099 and for 600 miles no cat code came up with this O2 sensor yet it was causing bank 2 to run rich and it threw it's own 2099 code. Do I buy a GM catalytic and hope these problems are due to bad cats?

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    ewill3rd is offline Cadillac Technician
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    Re: Rep.aced Cat on 2007 SRX still have P420

    As stated above, bank 1 is the right bank (passenger) and bank 2 is the left.
    P0420 is for bank 1 and p0430 is for bank 2.
    You say you replaced the proper one but you used a walker replacement and the code reset, you need to address that with Walker.
    The catalyst efficiency diagnostic is a specific set of tests which also includes the oxygen sensors passing their tests. A leak in the exhaust will likely set O2 sensor related codes, not a catalyst efficiency code.
    Someone is blowing smoke to get off the hook.
    You may continue to have issues using an aftermarket cat but technically EPA states that the manufacturer has to sell you a working part so....

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    frankcottnj is offline Cadillac Owners Member
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    Re: Rep.aced Cat on 2007 SRX still have P420

    Ok, that is what I was hoping to hear. I have all the codes printed out and a list report from the dealer showing it leads tothe CAT. I think Walker is making a CAT that is throwing off p420/430 codes. It is the dirver side P430 code I have. Thank you.
    frank

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