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I just bought a 2012 Mini Coupe S a few weeks ago and today I changed my oil just to be on the safe side. While I was in the area I notice that there was a open double prong port, that I assume to be a coolant sensor right below the intake pipe.
I have been researching as much as I can but I can't pin point what it is or why its empty. The car is running perfectly fine and if I wasn't changing the oil I probably wouldn't have noticed otherwise.
Its the old sensor and elbow, when you get the new thermostat part number there is a pigtail that bypasses this. So you just don't use that sensor anymore.