Getting codes is a ballache, some dealers will do it for free - but not all dealers can do it and sometimes even dealers that can check codes will not be able to find it. You'll have more luck if you have the VIN or at least the reg of the car it came out of.
If you mean simply for swapping cassette decks then it isn't a minefield at all.
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1995 Volvo 850 T5 Estate (Manual)
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