Fault code on a repaired crash damaged 03 WRX as above. It has a decat with a CEL fix (did have the expected code P0420 IIRC which was cleared and hasn't come back).

The engine came out and had a few bent valves replaced (from the impact), all drives fine.

Is this code referring to the front O2 sensor? I know Bob mentioned that the STi 9 front sensor was vulnerable to shock loadings.

Or is it due to a malfunctioning or incorrectly installed CEL fix?

I'm not familiar with new age cars and their myriad fault codes, so any advice welcome that I can pass onto the owner.

 

I'm pretty sure thats the code I was getting when my front O2 sensor was knackered, MY01WRX. Had to get a new one from Subaru....£300 not had any problems since.

 

Sensor 2 is the rear one, means its not working probably, so ecu is flagging the low voltage, front sensor is a current one so a voltage error would not be flagged. However its the error code for an AT vehicle not a MT !!! Also this code could come about due to a P0131 or P0132 error.

bob

bob

 

However suggest ditching the CEL fix as a cross check, notoriously problematical they are.

bob

 

Thanks Bob.

 

No problem, if you need the relevent diags pages from the manual let me know and I will pdf them

bob