i need to change my O2 sensor. my friend gave me one but i dunno where it came from. the harness came disconnected and I dont know which colors go where. it has green, white and two blacks, obviously the black is negative but I dunno which color is for which on the car harness. i have a 95 Civic EX stock motor.

 

buy a new one it will plug right up. dont cheap out on somthing like that

 

O2 sensors are picky about their voltage, Any slight resistance that isn't suposed to be there could set a code or cause your engine to run just like it was with the bad O2.