: What tap / thread size are the O2 sensor bungs on factory cats?

10-02-11, 07:17 PM
an O2 sensor got stuck upon extraction of my removed factory cats. I eventurally got it out to find some buggered threads. I would like to repair this but need to know what the tap size is? Thread and pitch if someone has it please?

thanks peeps..

10-02-11, 07:30 PM
18mm x 1.5mm

Most auto parts stores will have thread chaser in this size.

10-02-11, 07:30 PM
I always thought they used the same threads as spark plugs. Whatever those are.