Hello im new here. Basically i bought an Audi A4 B7 Cab about a week back, all running good no problems etc, until yesterday when a new Key Fob arrived. So i took it apart etc etc changed the key over and was trying to change the chip over but i couldnt so i just put i back together. I went out to unlock the car and the alarms and hazards were going off, key fob wasnt working atall tried re coding it and everything, had the AA out last night he couldnt do anything he recommended i take it to a Audi Dealership to get the key re coded. My friend who is a Mechanic mentioned something about if the battery is out of the fob for a over a certain time it loses its code. I know Audi will sting me for this tomorrow but i could really use some advice if possible, im sure someone must of had this problem or heard about it. Thanks Jason.