Quite common I believe, I've had to replace my passenger door lock mechanism a year ago. Apparently the solder dries out. With mine it would occasionally unlock but would always lock when I had manually opened the door.
I know that the A6 lock mechanisms fit my S3 so the chances are they are the same on the A4 too.
Thanks, makes me a little more confident taht it won't cost me a fortune as apparently if it is the door controller, you have to replace the entire metal panel behind the plastic trim that contains all the controllers and window motor
![Eek! :eek: :eek:](/styles/default/xenforo/vbSmilies/Normal/eek.gif)