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Old 07-16-2013, 06:17 PM   #1
Ctg1986
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Member#: 318895
Join Date: May 2012
Vehicle:
2009 Impreza
Silver

Default P0031 2009 Wrx

I have had a CEL for a while now after reading the code and clearing it multiple times it still reads the same P0031. Today I bought a Denso 234-9034 sensor as per advance auto parts fitment guide for $127 and change. Is this sensor that requires the removal of the passenger front wheel? Or is it located else where? Clear the code manually after the install or let the ecu relearn on its own? Any tips or tricks? Suggestions? Thanks in advance any help is greatly appreciated
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Old 07-16-2013, 06:29 PM   #2
Ctg1986
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Also with this bad sensor still in place for the time being would it make the car feel under powered/ hesitating at higher rpm's. Or do I have more problems ? Only modification is a nameless axle back
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Old 07-16-2013, 07:57 PM   #3
scby rex
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aw, MPS 2.34 breaking in

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Why two threads for the same ****? If you don't know were that sensor goes you might want to find a professional.
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Old 07-17-2013, 02:47 PM   #4
atomicfire
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P0031 is a code for the "Bank 1" sensor, which is the FRONT O2 sensor. This is the one behind the passenger wheel.

P0031 also refers to the O2 sensor heater. I could be the sensor, but it could also be the wiring. Have you been mucking around in that area of the car? If the wires were shorted, an unlabeled and undocumented fuse that's under the glovebox will blow. Try plugging the the new sensor in and let it dangle. Reset the ECU and then turn the car on and see if it still throws the same code.
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Old 07-17-2013, 10:44 PM   #5
Ctg1986
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Haven't messed with anything other than changing the axle back but I will check that fuse and try your advise when the new sensor arrives
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