If you have a 900, just stop by the dealer and they'll look up the code for you. It's linked to the radio's serial number. Paying them to program it is only something you do on the 9-3. So long as you don't lose the code, you'll never have to see the dealer about it again. The car originally came with a blue credit card-sized card with the code printed on it, but most people seem to have lost theirs.