In opensuse 12.1 having English (GB) as language and with norwegian keyboard I got the € character when pressing AltGr + 4 in txt console … In kde 4 my keyboard gave me a $ which is the character I’m used to get when typing that combination of keys.
In OpenSuse look in /etc/sysconfig/keyboard, in my case I changed the line KEYTABLE=”no-latin1.map.gz” to KEYTABLE=”no.map.gz” and I got my AltGr + 4 back to ‘normal’ .