I've got a spare that for an A3 that doesn't work probably due to no battery power. Is there a manual procedure to reprogram it to open the doors etc? With my BMW there is a manual procedure involving using another key and then syncing them all at once.
I've searched but can't seem to find a definitive answer for this! It's a 2007 car with the chunkier 3 button flick blade keyfob.