Oxygen sensor thread size

[John Larson]

You asked:  "Hi guys,

Could somebody tell me what the thread size is on the Oxygen sensor please?

I need to rethread the female side and need to buy a tap."

Thanks

Lino

18mm, same as old Ford spark plugs.  I forget the pitch, but it's may be 
1.5.  You should be able to find a spark plug tap , the "clean up"" type, 
that'll work.  Might have to go to a traditional auto parts store, though. 
John