I need an oil seal plus valve or switch identified please
 

I have a 2006 Mazda 3 MPS 2.3l turbo.
The item in question is the small round oil seal which has a valve or plug in the centre of it. There is a wire conduit over the wires attached or plugged in. This is located in front of the oil filler cap. There seems to be a split in this seal and allowing a small amount of oil to escape.
any help would be appreciated.
I've attached a photo to try help with location.