Mine was a blue wire, light blue. On the passenger side, under the consloe, is where you'll find the wire you'll splice into. There are two O2 sensors on the car, one from in from of the Cat converter (this is the one you want) and one from after. Both are blue wires, the wire closest to the front of the car is the one. Someone posted pix to help me one time last year, but I can't find them now.