Feuling Feuling 18mm O2 Sensor 9901. Life expectancy of an average oxygen sensor in a properly tuned engine is typically 30,000-50,000 miles. this is a 2 wire 2 pin connector . 2011 Harley-Davidson CVO Softail Convertible FLSTSE2.
Used oxygen sensors proved to be useful and much less expensive, in my particular situation. I would recommend buying used if you have the option to do so, but make sure they are the exact part number for your application.