How To Wire 4 Wire Heated O2

[boostmaster]

HI GUYS JUST GOT A 4 WIRE HEATED O2 TODAY AND WOULD LIKE TO KNOW HOW TO HOOK IT UP. I KNOW 1 WIRE GOES TO THE ECM, 1 TO POWER, 1 TO GROUND BUT WERE DOES THE 4TH WIRE GO. I WOULD LIKE TO GET IT INSTALLED SOON AND NOT WHAT FOR A WIRING KIT.

 

[The Radius Kid]

Your sensor should have a signal for the computer[GM is purple].
A ground for the signal[black if I remember for GM]
Two wires for the heater element[they're internally connected]
One of those goes to a switched 12 volt source,the other to ground.It doesn't matter which way for these two.Hope that helps.