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?