Why will my key not work? I've changed the battery,but it wont open the doors. on 2001 Mercedes-Benz S430

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Changed the battery in the key but still wont open anything. Any help would be greatly appreciated
(2) Answers
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You'll need to sync the key with your system. In short it needs programing. We can do that here with our Mercedes scan tool, same as the Mercedes dealer.
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