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Have a look in here as I measured both the full bolt and the thread:
http://www.cliosport.net/forum/showthread.php?671127-Dr-Jekyll-s-BG182-Project-Thread/page13
I read on here that it could be a bonnet alarm sensor. I ordered a new one from renault Wolverhampton and disconnected my old one and locked they I have been like my post above. Hadn't gone off for a few days and when the new sensor came I went and removed the old one and fitted the new one...
2004 BG182
JMS ported RS inlets
Scorpion RS192 + decat
Standard airbox with ITG panel fikter
JMS ecu reprogramme
75k (ish at the time)
My BG182 Rolling Road Printout by Dr-Jekyll, on Flickr