Bad front o2 sensor?
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This is a discussion on Bad front o2 sensor? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; CEL tonight on the wrx, plugged in AP and got P0031. After a bit of searching through the forums I ...

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    Bad front o2 sensor?

    CEL tonight on the wrx, plugged in AP and got P0031. After a bit of searching through the forums I found a possibility of melted wires due to not being run through the clip at the top. Well the wires were all in good condition, seemingly. I used a digital multimeter to test the white and blue wires for resistance and came back with nothing. i also just tried the black wires for kicks, nothing there either. Oh, I also tried resetting the ecu, light came back on after about 10 seconds.

    Bad front o2 / A/F Sensor? Is there any particular thing that can CAUSE this or is this just something random? Anyone have any suggestions of what else i should try before ordering a new sensor? And if it is the sensor, where should I get one?

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    no one?

    on a side note, i called the local dealership and it's $390 bucks for the sensor. Amazon has it for $105. nice hey?

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    Registered User EvoEatr's Avatar
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    What mods are you done to your WRX, particularly the exhaust? What year is it? Thats almost a hard fault if the CEL comes back on that quick. Is your WRX automatic or manual? Do you notice any rough idle or decreased fuel mileage? A lot of subarus are very touchy with aftermarket components ( catalytic converters, ignition components, thermostats, and axles to name a few). There are people who will tell you you can wire in a this brand sensor and it will work but as far as a front AF sensor I would most definitely get it from Subaru if that is indeed your problem....How many miles are on the car?

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    Quote Originally Posted by EvoEatr View Post
    What mods are you done to your WRX, particularly the exhaust? What year is it? Thats almost a hard fault if the CEL comes back on that quick. Is your WRX automatic or manual? Do you notice any rough idle or decreased fuel mileage? A lot of subarus are very touchy with aftermarket components ( catalytic converters, ignition components, thermostats, and axles to name a few). There are people who will tell you you can wire in a this brand sensor and it will work but as far as a front AF sensor I would most definitely get it from Subaru if that is indeed your problem....How many miles are on the car?
    I'll answer your questions but first I will post up that i replaced my front o2 / A/F Sensor with a new one and the cel is gone. In case anyone else was waiting for an answer on this. I bought a denso sensor on amazon. reviews were great so i went for it. if i have any issues with it down the road, i will post in this thread.

    04 wrx 5speed manual. Cobb SF intake, turbo XS RFL blow off & cbe. Currently in stage 1. CEL wasn't on long enough to notice whether or not i was getting decreased fuel mileage and my car has 88k miles on it.

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