My son has a 2007 3 door a3 sline tdi 170bhp tdi got home and the driver's side lock started to play up central locking fine on the other door just the driver's side you have to unlock with the key been looking on the net and from what people seem to be saying, is the mechanism is different to a 5 door does anybody have a clue if this is correct or not because we are finding it hard to find a lock mechanism for a 3 door car thanks for any help.