Im not shore if there is one sensor on crankcase.Crankcase breather heater?
It is possible that plug belong on the other side of engine.BobnOH....
It is BLS year 2007kcunniff...
that was going to be my guess, but not sure on the golf 5, on the mk3 and mk4 have square 2 prong, not round like that, but its in the right spot.Crankcase breather heater?