this electrical connector is at the rear of the engine on the underside of the car near the trans. I need to replace mine and I don't know what it's called

 

If the transmission is at the top of that picture, I believe that is the crankshaft position sensor, the thing you take out for putting in a locking pin in for timing stuff

If you need the connector itself it should be listed in the electrical guide

 

the picture is the back of the engine block where it exploded

 

Crankshaft sensor. It is attached to the rear of the engine and works on the flywheel/flexplate.