Remote keys have stopped working to lock/unlock the car but manually they work. on 2005 Audi A4

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
We know its not the batteries in the keys, but something in the car. Does anyone know what the problem is or what it would it cost?
(1) Answer
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You have to scan the modules that read from your remotes, and verify the are pair to the vehicle.