I have the regular BMW Business Radio/Cassette head unit in my 1999 318ti.
The tape plays fine, but when I press the eject button, the mechanism
chitters and doesn't eject the tape. The display helpfully says "ERROR".
Is this a common problem? Is there a neat trick for getting a stuck tape
out, or shall I have to remove the head unit to do it? If so, is it
complex to reconnect?