My 95 Honda prelude is leaking oil bad, it's leaking from the part directly behind the oil pan. What is that part called?

I don't see a parts listing for a Crankshaft position sensor...are you sure that's what you are looking for? They are usually located in one of two places on any car, either behind the harmonic balancer or in the middle of the block above the oil pan, usually on the backside of the motor.

IN a car this old, the drain lines in the head for the oil might be plugged up. Check them and replace the valve cover gasket

trying putting silicone on first and tighten down in a crisscross pattern first hand tighten all the bolts then finish tightening the rest of the way

Oil pressure sending unit comes to mind. The oil pan sealing flange comes to mind.

Yes, I think you're right that it's the seal that is leaking.

Are you sure it's leaking out the oil plug ? or is it leaking from the oil filter ? sometimes the gasket to the oil filter sticks to the engine block and it will leak like a heck, let me know what year, make , model, engine size.

normally a gasket between oil pan or sump as we call it try tighten the ring of bolts on oil pan

yes oil pressure switches are a common source of leaks like this.

If I rember correctly, there are two freeze plugs in the back of the block, behind the flywheel. They generally dont go bad often because they are pretty much protected. As that angelo guy said, more likely a hose or rear of intake gasket, but you have to look, from here I can't see it!!!

There are two slots in the valve cover right by the cam shaft sprocket that have to be honda bonded or black rtv. look closely at the valve cover right above the gasket underneath the timing belt cover. Hope that helps.