if you have a second working key you can program the one thats not working without a vag-com
Originally Posted by The Tex
To program a remote:
1. Stick existing key in the ignition and turn it on (but don't start the engine).
2. Put new key in the driver doorlock, with the door closed.
3. Turn door key counterclockwise and hold until horn beeps.
4. Keep holding. Press any button on the remote in the door until the horn beeps.
5. Take keys out.
New remote is now programmed (it will be a couple of minutes before it works, though).