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This is a discussion on another P0420 thread within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Originally Posted by Donkey The service manual shows you a picture of exactly where it is. There are only two. ...

  1. #16
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    Join Date
    Feb 2012
    Quote Originally Posted by Donkey View Post
    The service manual shows you a picture of exactly where it is. There are only two. One before the turbo and one after. By merely looking under the car you would see exactly where the sensor is located. The service manual will give the full troubleshooting "tree" for a P420 DTC. It is located in the OBDII section. Have you even tried looking through the manual at all?
    lol yea. There's so much stuff to go through. I looked through it for 3 hours and found nothing. I'm probably going to end up taking to a shop. Really don't want to but like I said I have no time for this

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  3. #17
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Da boonies,Va
    I Support ClubWRX
    Seriously.......It took me 5 minutes to find it. Go to en (H4DOTC)>Engine Diagnostics>Diagnostic Procedure with DTC>P0420. The rear O2 sensor is located in the 3rd (last) cat in the system. You would have immediately seen it by jacking up the car and looking.
    Last edited by Donkey; 03-15-2012 at 08:59 AM.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S

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