I suppose it could plug straight in, the sensor itself is a 'Male' plug while this port is the 'female' end. Wonder if there was a Male-to-female extension that threaded through to the rail under the bumper?
It'll be impossible to tell without knowing where that plug goes to however - although I'm suspecting it may go to the centre console, and then onwards to the instrument pack if suspicions are correct. I've just not seen a plug like that for anything else so I don't know what else it might be