when my stacker played up in my car it had e-99, but i replaced straight away with new cd player. Later found out the e-99 means either one of the stacker cables not in properly, magazine was not in propely or the stacker needs to be reset, i remember reading it from eurovox website a while back. Just check all the cabling , and reset the stacker(pull the cable out from the stacker and stick back in) check the magazine is in properly and that should fix ur problem. I wish i had known that before i ripped my standard deck out

i miss using my steering wheel buttons!