I just purchased the vehicle, and the previous owner cut the wires or they were pulled apart by the drive shaft. I see four cut ? wires from the harness , but only two wires from the excisting rear O2 sensor. I purchased a bosch O2 sensor that has 4 wires and a female connector on it. I have splice connectors and water prove wrap... but I dont kow which wire goes where?

I finally was able to hook up the O2 sensor, But my wires were a different color combination.+ Im getting mil light codes P0141, P0138. I believe the wires are not hooked up properly, I tried to match the colors as close as possible, This is what I did, Top right Dark/Green , Green / White

Bottom right Black / Light Blue , same

Bottom left Black / Pink , Black / White

Top Left Black / Tan , Orange or maybe a green ?

It is the rear one. I replaced it with a Bosch, had four wires, 2- black, one white, one grey.

OK thanks, XXXXX XXXXX this vehicle about 3 weeks ago. The previous owner told me it needed a rear O2 sensor. I thought no big deal. But this morning the car would not idle. Every time was a hard start then it would die if you were not giveing it gas. So I figured to start with the O2 sensor becuase I knew it needed one. Thats when I discovered that the wireing haarness connection was missing. I did notice that the check engine light was off, I thought that was wierd becuase it had always been on since I purchased the car. I figured that it was on becuase of the O2 sensor. Do you think that the O2 sensor would some how create the problem of not idleing, even after 2-3 weeks of driveing the car with no problems.

left hand drive It is a U.S. vehicle I even had my wife double check the wires they did not match. The car is running now but has the check engine light on and showing those codes .