O2 sensor thread size

[tvelardo]

I just removed the O2 sensor (drivers side, before the cat) and the threads need to be retapped to put in the new one. Does anyone know what size the threads are? Looks like an 18 mm, but I don't want to mess up either the hole or the new sensor. Thanks.

Tim

 

[Cobraguy]

It is the same thread as the old large spark plugs. 18 X 1.5.

Here's a tool: http://www.autobarn.net/threadchaser.html

 

[tvelardo]

That's great, thanks for the help.