I have an Audi A3 1998 1.6 petrol. Opening the car with the key is fine, but some time now the remote locking has completely stopped working. I've replaced the batteries in the key(s) and also had the car checked out at a garage. They could not program the key despite it being a simple job. They said it might be to do with some receiver in the boot of the car. Do you have any idea what fault is likely to be causing this? Also what the part is and how much it will cost to fix? I am in the stoke area.