What to plug o2 sensor bung?
 

I just purchased a bursch cat bypass pipe for my 1978 sc and was wondering what I can use to plug the o2 sensor bung? I couldn’t find a suitable plug at my local parts store and I don’t want to have to by an O2 sensor to plug the hole.

HI use the oil pressure relef cap nut from the crankcase of a 911, part No' 999 064 026 02.

regards mike

I have not tried it but some here said a spark plug will fit.

A simple 18 mm x 1.5 bolt would do...maybe with a washer

http://forums.pelicanparts.com/porsche-911-technical-forum/146234-where-can-i-get-bung-hole-euro-premuffler.html?highlight=bung+Ferch