1996 Jetta O2 Sensor problem
 

I took out the upstream O2 sensor to replace it. I started screwing in the new one, seemed a bit tight, and then it stripped. Anybody, know what size tap that I could ream out the threads with?

I have no idea what size the threads are all I can suggest is to measure with calipers the diameter of the O2 sensor threads. All O2 sensors are the same size.