W203's have had many issues with lamps and lamp failures. Check out a W203 specific forum for more info. You could try mbklasse.com/forums/ for info from those guys. Very knowledgeable and all own W203's. Mine has an issue where the license plate bulb keeps going out, but is not blown. It works most of the time then every once in a while it does not and I get the MFD telling me I have a Malfunction and the left license plate light is out.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....