If you don`t have the "Audio Manual" booklet with your car`s paperwork, then the radio will have to be taken out of the dashboard using special extractors and the code will be written on the side (usually beginning with M******).
Ask another question quoting this Serial Number
RegWorts
May 2008
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cassette players.