My son has a 03' 3 series sedan. Both keys have stopped working (keyless entry) and after replacing the battery in one of them it still doesn't work. The central locking still works from the button inside the car. Is it possible to fit an aftermarket keyless entry kit to the existing central locking and just retain the keys to start the car?
No. Your problem isn't the keys, obviously. Go to E46Fanatics and search for key resyncing.
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