I ordered a new one today. the shop manager/mechanic said it is just a simple install. I think in the Alldata, it refers to the specific one, L5 of the two, if you have more than one sensor, and if it is "Crankshaft Position Sensor Function, w/Increment Control", it is a single unit, not 2 seperate ones, it is a simple plug and play. In mine anyway, it is just an install.
It's funny, this dealer/shop said the last one he ordered in and installed was 2 years ago. This is a smaller city, so I am thinking maybe there was only 4-5 of this year and model around. Mine is a '99 ML320.
I will try my OBD2 tonight, see if it shows a stored code for this sensor, and yet it might not , will see.
Thanks again!