Fello LCB-ers, I have fitted an ex-Westfield exhaust to my Zetec silvertop. This exhaust has provision for a temperature sensor (I think?). I need to fit a plug to this hole; does anyone know what the thread size, please?

Probably it’s for a Lambda sensor usually 18mm by 1.5 ? I may possibly have a bung but ask at your local motor factors if your in a hurry

if it is for a lambda sensor, /quickanddirty/ you could fill it with a spark plug! /-quickanddirty/
but you might be better with a lambda sensor anyway.

Guys, thanks for your swift replies. So M18 x 1.5 it is.