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Old 12-04-2010, 02:03 PM   #1
Scooby Newbie
Member#: 193881
Join Date: Nov 2008
Default O2 sensor problem

Hey all, I recently finished putting a 2003 wrx engine in a 98 RS using the wiring harness from a 2004 wrx, the only snag I am running into is the front O2 sensor. I am getting a P0031 code, I changed the sensor and it didn't fix the problem. I measured the voltage at the connector and got the following:

Small white wire-4.7v
Small black wire- 4.7v
Large white wire- 3.4v
yellow/red wire- 12v

I remember reading somewhere that there are two wires for the O2 sensor pinned out in the ECU differently between the years 2003 and 2004. Because I am running the 2003 ecu with the 2004 harness, this could be my problem, but I can't find it again to know which wires to change.

Any help is greatly appreciated!
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