My father in-law put in a new battery in his "new" '92 190E 2.6 The radio display says "code". Now, the car did not come with it's orignal owner's manual, he got one from local dealer. Is there a default code that someone could tell me, does he have to take the car to MB, or is he basicly hosed? Any info would be appreciated.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member