A4 Cabriolet, B6, 52 reg. The other day my fob stoped locking or unlocking the car, now i have to open with the key. The central locking works from the buttons on the door once in the car and the lights blink when locking / unlocking with the key. I have had the fob checked for a signal and was told it is ok. I tried to rematch the key to the car following the methods on the forum but no change. Any other ideas of what could be causing the problem, Cheers.