I had the same problem - ERR3 on the display, wouldn't play or eject discs. I removed the fuse marked RAD no 1 (in the fusebox in the engine bay) and then replaced it. The CD changer then cycled through all the discs in the changer and I was able to eject them. If you have jammed two discs in the one slot in the magazine this may not work, though. I was getting ERR3 because of a duff CD (shop bought - not a CD-R or CD-RW).