My dad was driving through a field the other day and snagged the o2 sensor wires on a limb or something. Anywaysall thats left are 4 wire ends from the wiring harness and four from the sensor itself. We've called every ford dealership and auto repair center around but they havent been able to help. Just need to know which wire matches up with which wire. Any help will be greatly appreciated. From the sensor there are two white wires, one gray and one black. From the harness there is a gray/blue wire, purple/orange, orange, and a black wire. This is on a 91 f250 w/ 351 windsor and 5 speed and is the sensor just in front of the cat converter