Rear Denso O2 Sensor
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This is a discussion on Rear Denso O2 Sensor within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi there, I am looking for a replacement for my rear O2 sensor in my 2003 WRX 5-Speed. I can ...

  1. #1
    Registered User
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    Jul 2011
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    Rear Denso O2 Sensor

    Hi there,

    I am looking for a replacement for my rear O2 sensor in my 2003 WRX 5-Speed. I can find a lot of info on the front, but not too much about the rear. I believe I have narrowed it down to these:

    Front Sensor

    Rear Sensor

    Are these the wrong parts? My rex is throwing a P0420. And I'm hoping this is a good place to start to clear this code. Any help is appreciated. Thanks.

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  3. #2
    OMG WTF MainFrame's Avatar
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    Sep 2002
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    I Support ClubWRX I Support ClubWRX
    That sensor isn't even needed. Personally, I'd just find someone with a Tactrix cable and defeat the code through the ECU.

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