yes thats true car goes dead with key lost even that authorized dealer of mercedes in lahore have no solution.
we thought of almost every thing to make the car move we thought of putting some another engine but unfortunately no engine comes fit in it.
thats the monopoly of mercedes.
its like making you dependant forever on the company of which you purchased product.
immobilizer system need to be changed and it can only be done by mercedes. that immobilizer system should be a 3rd party aftermarket product.