overlander

Hi I have a Mk 1 with a Ford 2007 RDS radio which has column stalks and is powering a remote CD changer, since replacing the battery the radio is showing an EE code on the display ( this code came on straight after changing the battery there was no "safe" or "code" message displayed ). Does anyone know how to get rid of this code or should I be looking at replacing the set with something else. Will a 5000 rds radio fit straight in and run both the CD changer and column control. Thanks