Leak on Left side of my 2005 CBR600RR

I own a 2005 CBR600RR and while changing the left middle fairing on the bike I found a leak on a component that is located right behind the radiator. It has what looks to be a sensor but it leaks on the bolt that makes the connection. I’ve checked the web and looked over manuals but no luck in figuring out what it is. Please help.