Lambda sensor thread size?

[georgeb]

I've just taken the plunge and ordered these as they came on sale.



The eagle eyed will notice they have a lambda boss on each pipe both before and after the cats, presumably to make them applicable for the US market. My RR, being a European model only has two the pre-cat sensors.

Anybody know what size/thread nut I'll need to block of the two post-cat ones? I'll get a couple bought and not be brought to a halt halfway through the job!

Thanks in advance.

[georgeb]

Updated question now!

[cobblers]

It's the same as a spark plug, I can remember that much. You can buy proper bungs off ebay though, they aren't expensive.

[sowen]

I think they should be M18x1.5, I used an old aircraft spark plug to fill some up in the past

[Midas]

Yep, should be M18x1.5, the blanking plugs are available for not very much on eBay.

[SamR380]

They will be M18x1.5, but not all spark plugs are. When I tried it at the weekend my MX5 plugs were smaller.

[georgeb]

Great guys, thank you. There's a little bolt shop around the corner, so I'll pick a couple up.

Cheers!

[welshpug]

they're not all the same but the most common as mentioned is 18x1.5.

[georgeb]

Ah well, if it comes to it, I'll just take one of the cats in and let the little man grovel around 'til he finds something.