If you ever need to reprogram it here is the instructions:
REMOTE CONTROL CODING FOR CENTRAL LOCKING ANTI-THEFT SYSTEM IN A3 VEHICLES
It's the matching method for remote controls with the central locking anti-theft system of your car. Is possible to match until four remote
NOTE: You need to have the set of two car keys and all remote controls (old and new ones) that you want to program before to start this procedure.
1. Put one of the car keys into the ignition lock and turn it until reach ignition position.
2. Put the second car key into the left door lock. Turn it counter clockwise until reach unlock position. Hold it 10 seconds then you will hear 3 beeps. Release the key.
3. Push any button of first remote control and you will hear 1 beep, push any button of second remote control, and you will hear 2 beeps, and so on. The remote controls that already were delivered to you at moment of new car delivering will be necessary to program again in this moment.
4. Again put the second car key into the left door lock. Turn it counter clockwise until reach unlock position. Hold it 10 seconds then you will hear 3 beeps. Release the key.
5. In this moment your system is prepared to be operated with the all remote controls (old and new ones). You can retrieve the car keys in any order that you desired. controls (old and new ones) by the following procedure
Also if the alarm ever sounds and you can't get it to go off, put the key in the trunk and it will stop.