DTC P0031 Questions
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This is a discussion on DTC P0031 Questions within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 2002 WRX Wagon that I just purchased used. It has a P0031 code which says it is ...

  1. #1
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    DTC P0031 Questions

    I have a 2002 WRX Wagon that I just purchased used. It has a P0031 code which says it is a HO2s Bank 1 Heater Circut Low.

    I can not find the Oxygen Sensor.

    Question, what side of the car is Bank 1. Driver or Passenger?
    Where is the O2 sensor locater?

    I have a repair manual on order, but have some time next week and would like to get the thing replaced.

    Any help, pictures, extc would be appreciated.

    Thanks

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  3. #2
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    Thumbs up Problem fixed thanks to Schrags excellent photos and instructions.

    I found a similar thread from a while back, and Schrags had pictures and instructions on how to locate the HO2 sensor, how to remove the heat shield, how to modify the heat shield so that it will come off without taking to sensor out first, and got the new sensor in.

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