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There are a couple of reasons:

The battery is dead - replace battery. Some auto parts stores have a remote tester that will show if the remote is transmitting.

The contacts on the fob have a buildup of carbon - open remote and use a pencil eraser to clean the contacts.

The unit has lost its sync with the car. Go to a good locksmith or the dealer to have it reprogrammed.

Or, the remote is broken.

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Q: Why won't my Mercedes Benz remote key unlock the doors?
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