i have a 95 civic ex 1.6,right behind the head there is are several censors they look all connected together i think they are,throttle body sensor,manifold absolute pressure sensor, idle control , i have a serious oil leak where all these hook to head, i tried tightening bolts and now car wont run smooth at all, my question has the oil fouled out one of these sensors ? can i purchase just one of these sensors at a time? thank you

 

The only part there that has oil in it is the VTEC solenoid, which is on the end of the head closest to the transmission. It's common for the gasket to blow and cause a major oil leak. You need a new gasket, I think Honda calls it the "VTEC filter" because it has a strainer screen in it.

All the other parts you mentioned are actually mounted to the intake manifold, the big cast aluminum piece bolted to the back of the head.