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Originally Posted by ProfessorX5
LOL... ah well at least a new sensor isn't expensive.
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A new O-ring should actually do it. You need to know the dimensions for it. The OEM O-ring is green, and will shrink in time. There are aftermarket O-rings (black in color) made out of Viton I believe, and these will NOT leak even after years of use. The "Fanatics" have put together a post with interchangeable parts (you have to search for it - the title I believe has the words "BMW interchangeable parts" in it), and also the "Festers" have this O-ring issue documented, but again you have to search. For this one it's a thread by "Bluebee" I believe and you have to search "coolant sensor" or similar.
No need to buy a new sensor if it's working OK. Just use some 2000 grit sandpaper maybe and clean the brass element from deposits, if any.