I've just changed the battery in one of the remotes and it now fails to open and lock the car. I've been through the "re-synchronising the remote control" process described in the manual (page 61 - pressing unlock on the remote, switching the ignition on, removing the key) - but this doesn't work. I rang Nottingham Audi and they said I would need to bring it in and they would run the remote through the computer to diagnose what the problem is. They also kindly said they might charge for this (wouldn't commit to whether they would or not) - so if possible I want to avoid having to take it in. I'm convinced that the remote is not faulty, as it was working until I decided to swap the battery (replaced with another new one since - just in case). Have I just missed something obvious? Has anyone had this happen to them? And if so, any ideas?