ml
i would hope the tech would know better, but i have seen many mercedes Ml's develop this problem, at the shop were i work we have seen quite a few with this, and it always has occured either during jump starting or while replacing the battery. what appears to happens is if the key was on or even in the ignition when the battery was replaced or while jumper cables are connected, it appears that the voltage spike that occurs during this action some how removes the key from the programming in the AAM and renders it useless, i have seen some that when a new key was used it will start, and on others the key and the all activity module has to be replaced. before you go too much further you might try another key.
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