I've got a used Bosch o2 sensor that is about 30k old. I pulled it off my car to be replaced with a longer one for my new headers. It works fine and is for an early model m20. $40 shipped 48 con US.
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1986 911 Supercharged Frakenstrat/Stripped
1987 325is Delphin/Black (Olga)
1988 M3 Zinno/Natur (Elsa)
Manual or STFU
E30 Chapter of BMW Car Club of America
E30 Oktoberfest 2017