Car radios are so cheap now so why have this ridiculous code system; it's a nightmare! I'd rather have the radio pinched and get another without a code system than have this agro. On my Peugeot 306 I punched in 7 possible codes like 1111, 2222, 1234, etc but then the 7 Error display came up and the radio doesn't accept any more trials. As suggested, I'm leaving the radio on now and will see in a few hours if it has reset as has been suggeated. I have worked out a code using the last 4 digits of the serial number and hope that this advice will get things back to normal.
Tony Smith, July 2012