It will be recorded by the dealer who supplied the car to which it was
fitted, when the car was new.
Your chances of tracing that are very slight!
I suppose you can go through all the 4-digit (or whatever) codes until
you find one which works - but that could take a *long* time. Many
radios make you wait for progressively longer times between attempts if
you keep getting the code wrong.
ISTR something about putting the radio in the freezer to make it
"forget" its code - but I've no idea whether that works.
The manual makes no mention of codes, I'd only expect them with a
factory fitted radio
But it does have a helpline phone number.
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