Do you have a paper copy of the owner's manual? I'd expect there to be a place in there that should tell you what the warning messages mean at the very minimum. If it's a maintenance minder type of thing, it may even give you a reset procedure, though if it's emissions, it may be a dealer type thing.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)