Thanks for the suggestions.
I have asked my son to look in the trunk, i have sent pics to him found in that beautiful link you sent!

zip439 can you please elaborate more on why it may be the crank position sensor? It is my understand that the most common symptom when the crank sensor fails are that car starts when it is cold yet it may not when hot. this was also my experience before replacing it, Also i remember i was able to crank for several seconds, at will. now the cranking just stop after 1 second or less then at some point it does not crank at all.

I will read more about the scanner. i can see they are available on amazon. the Foxwell nt530 goes for about $170
and allows to add other cars software for $60.
I am debating If It is better buying the scanner or going to the Mercedes shop at some point. If i buy i may be able to read the codes yet if some of the setting need to be changed (remember i got a re-manufactured one )
I may not be able to and would need to go back to them anyway

Thanks!
Salvo