I'm wondering what the four wires on the O2 sensor are for. I'm assuming one is 12v, one is ground, one does a signal but im not sure what the other. Off hand, I don't recall the colors of each--that might would make it easier.


Thanks
Edited by: sw2cam

Maybe it's a preheated 02 sensor.

I think it is. One wire is constant 12v and one is groundI think those two are the O2 heater. The remaining two both fluctuate but im not solidly sure on which is the signal wire.