I have a used Oxygen sensor that I recently removed from my car. It is a stock replacement single-wire sensor. There isn't anything wrong with it. I removed it to convert to a 3-wire sensor. I took care to ensure the wire was not damaged during removal. It has exactly 1,082 miles on it. I'm asking for $10 (which should be enough for shipping and for me to get something to drink on the way to the post office).