I stripped my o2 Sensor threads when changing out my ypipe. Does anyone have tap size info?

 

It's 18mm in tap size. I bought a spark plug thread chaser with two different thread chasers on it from Carquest. It cost me around $6. It looks like this.

 

Thanks a bunch for your advice. BTW, how chewed up was your o2 bank?

 

You're welcome. I changed the 02 sensor on my truck (4 cyl) and I did not look at the hole itself. Judging by how hard the old sensor came out and the condition of the threads, I knew that the new sensor would not thread in and seal properly so I did the thread chasing to make it right.