where's the crankshaft sensor located (EXACTLY) on the 2005 ml 350 how 2 replace

It is in the top rear of the engine compartment in the bell housing. Look at www.rockauto.com you should see a good illustration of the part.

Hi my name is Jonathan. I work at Mercedes Benz of Ft Lauderdale. We can show you and replace it. Please call me if you have any quesitons. My number is 954-713-1049. Thank you