This is what I have, the plug for a D16z6 and a used but supposedly good o2 sensor that my friend gave me. White and green wires are obvious... what about the two black ones? Thanx

 

believe they are the heater wires..

 

I'm just wondering if those two black wires go together only one way or what. C-3, or C-4? D-3, or D-4? As I labeled them in the pic.

 

they all run idividually.. if you look they have four prongs in the connector...

 

Yes, four prongs, I can see that. But which black wires should be wired to each other? I don't want to wire them up the wrong way, if there is a wrong way, and fire up the engine only to kill the sensor or some stupid shit like that. Obviously I don't know much about this, which is why I'm asking here.

My old O2 sensor is bad, right now it's in the exhaust header but disconnected (with no plug). So I can't just look at my existing sensor and figure it out. Would like to have a better gas mix without spending $80 on a new sensor...