04 WRX oxygen sensor problem
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This is a discussion on 04 WRX oxygen sensor problem within the Maintenance, service, and repair forums, part of the Tutorials & DIY category; Hi, to anyone who may be able to help.. The o2 sensor on the front cat blew off while running ...

  1. #1
    Registered User
    Join Date
    May 2009

    04 WRX oxygen sensor problem

    Hi, to anyone who may be able to help..

    The o2 sensor on the front cat blew off while running the car, it seemed to build up pressure and "pop" it was hanging down with the hole to the cat open.

    I have not had any problems with the sensor before, but I cant seem to fit it back. There is no thread on the sensor, it just sits loosley on top where it should be and there does not appear to be any clean breaks to any of the surrounding area.

    I think the sensor is fine but does anyone know how to secure it back in place or why it happened in the first place.


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  3. #2
    Registered User
    Join Date
    Aug 2008
    Do you have an aftermarket uppipe?

  4. #3
    Admiral Ackbar the 1st mycologist's Avatar
    Join Date
    Oct 2005
    Late Devonian
    I Support ClubWRX
    That is really unique. It blew out with the bung it is supposed to screw into. The thing on the threads of the sensor is part of the pipe - it was supposed to be welded on there.

    If it is stock, maybe your cat got plugged and built up a ton of pressure.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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