There are 3 wires coming out/going to my sensor now. My new one has only one wire. Which wire do I hook it to?

Steve

 

why do u have 3 wires? stock o2 has only one wire.

 

if i'm right, 3 wires, one is black, two are white. It's one of the white wires that gives the signal. The other white wire is 12V and the black is Ground. With some Multimeter fun, you can figure it out.

Danny

 

Sounds like someone put a heated o2 sensor in your car last time it was changed.