Intermittent P0420 code

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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, Intermittent P0420 code in Cadillac SRX / XT5 Forums; Hello all, Have a 2006 SRX, v6, 184000 kms.on it (114330 miles) MIL comes on after code clear in 2-3 ...
  1. #1
    Daveros is offline Cadillac Owners Member
    Automobile(s): 2006 SRX
    Join Date
    Jun 2013
    Ontario, Canada

    Intermittent P0420 code

    Hello all,

    Have a 2006 SRX, v6, 184000 kms.on it (114330 miles) MIL comes on after code clear in 2-3 days of driving, Has P0420 code. I have access to a GM Tech-2 scan tool and some prior experience.
    I have cleared the code and driven the car as normal for 2-3 hours while monitoring the o2 sensors (all 4) with no apparent out-of-range data from them at any speed/load.
    Has anyone out there encountered this same or similar issue? What was the ultimate repair?

    Thanks for your help.


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  3. #2
    glake89's Avatar
    glake89 is online now Cadillac Owners Connoisseur
    Automobile(s): 05 srx awd v6 (on the way out), '07 GXP, 2010 li'l red wagon 3.6
    Join Date
    Aug 2010

    Re: Intermittent P0420 code

    Sounds to me like the right side converter is going bad.
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