Not after a radio code par-se but this seems the best place to ask! My 2006 RDS in my mk3 Fiesta was working fine until yesterday when I tried to turn it on and it lit up but nothing happened. Took it out, unplugged it, plugged it back in and it asked for the code - put the radio code in and it worked.
Same thing today, but this time taking the plug out didn't help, and it lit up with the letters "EE" then does nothing....