My Megane is a 1998 model, the numbers can change via the controls next to the steering wheel. The function which allows you to change the channel (Round tuner) allow you to select each code number.
Tony Sutherland
February 2005
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 in-car audio.