If your talking about the o2 sensor is a capasitor and a resistor.

I have the specs on scoobymods.com under electronics for a diagram of how to splice in a cel fix for the 04 model. Probably will work on the 05 model too.

Btw you'll need to clear the code when you get it hooked up.

 

yes it will work on 03 wrx. i did it on my ride and have no cel.

 

I suppose i could just paste it again here :P

 

Oh its pretty easily splice the wires from the rear o2 sensor under the car and add the components.

Get yourself a non polarized capasitor so you don't put it in backwards (non polarized is undirectional)

There will actually be 4 wires on the o2 sensor just ingnore the black ones, They just heat the unit. Solder in the components and tape it up and you should be able to clear the cel light and keep it off.

I tested that model with an 04 wrx thats still runnin fine.

 

so are you just cutting the blue wire and placing the resistor in line . or do you have to do something with the white wire also ? and does this work for the upipe also ? does the rear o2 work afterwards or is this just bypassing it ? thanks alot

 

you can buy the helix cel fix from mpj, thats where i got mine done...after i watched what they did its actually very simple...