Strange problem

Well guys my car was away to see the auto spark due to some electrical issues. So long story short I got the car back but it had thrown the toys out of the pram later that evening throwing the eml back on and thr coolant sensor doing the sweep thing I had mentioned before. So I collected the car again today and the spark said the coolant sensor plug was full off oil again? So I asked the does it have an oil leak somewhere but they weren't 100% sure so I'm wondering if anyone one knows here has had the same issue to point me in the direction I should be looking for the oil leak.