Help recognizing a sensor
 

Any input? I did try online catalog but maybe didnt look good enough
looks like i get some oil leakage there...or maybe its from surrounding area and just dripped on it
https://cimg2.ibsrv.net/gimg/www.mbw...25fd7a36c2.jpg
https://cimg9.ibsrv.net/gimg/www.mbw...bb2fb4a7d4.jpg

Nothing on that intake manifold comes separate. I believe you are looking at the switch over valve. There is no oil that goes to it? How in the world did you notice oil is leaking from there? There is a very small amount of oil in the intake mani but not enough to spill out.

https://cimg1.ibsrv.net/gimg/www.mbw...3a4b80e65.jpeg
There's always going to be oil there, especially on our older cars. Mine was getting a bit too dirty and I removed the intake and cleaned it. It's a good time to inspect the plastic tumble flaps, look for cracks and movement freedom. On mine, the bolts which hold the intake manifold to the block were a bit loose, which generated a lot of dirt and oil contamination around the manifold perimeter. You'll need two gaskets and while you're in there it's a good idea to replace the lower injector seals as well (it's an easy job). If you haven't, replace the PCV breather cap (passenger side cillinder bank) as that might be one of the causes for excessive oil in the intake. I wrote about it in my presentation thread.