P0031 Code
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This is a discussion on P0031 Code within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Heated Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1). Finally a code popped up for the wagon. This ...

  1. #1
    Registered User scoobaru03's Avatar
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    P0031 Code

    Heated Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1). Finally a code popped up for the wagon. This is the only one on. Now Would Bank 1 be the right side of the engine and sensor 1 be the sensor in the right side header?
    2003 Impreza WRX Sport Wagon

    "I wouldn't want to belong to a club that would have me as a member." - Groucho Marx

    Is it fast? I don't even know if its street legal. O.o (IROC-Z)

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  3. #2
    He simply abides. SD_GR's Avatar
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    There is only one Bank.

    The sensor to which you refer is the front sensor; side isn't relevant as there's nothing on the other side. See this thread and follow the links therein:

    O2 Sensor :(
    WRX Info Links, Courtesy TheJ
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  4. #3
    Registered User scoobaru03's Avatar
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    yea strange thing happened when i was doing the diag i got 14.XX volts on power on the the harness side of the connecter for the A/F sensor. Then i checked the ground side and it dropped to about 10.XX. i figured 4 volts was alot of voltage to drop. I figured i had high resistance somewhere in the wire between the computer and the connector but it checked out ok. Long story short the A/F sensor was open so i get to spend some more money..yay...but i was wondering if anyone knew why the ground side would drop about 4 volts like that with normal resistance.
    2003 Impreza WRX Sport Wagon

    "I wouldn't want to belong to a club that would have me as a member." - Groucho Marx

    Is it fast? I don't even know if its street legal. O.o (IROC-Z)

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