Date registered: Jun 2008
Vehicle: 2000 w203 c200k (Yes, it's a w203 from Germany)
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I'm with j99 on this. The sound is typically the traction modulator actuating the brakes, as well as the clicking or cycling of a butterfly in the intake and associated relays, sometimes. If you can't duplicate the odor, then I wouldn't worry, but if you're not 100% sure, then by all means, take it into the dealer. There could be some wiring trouble, but I'm very doubtful of it. A burnt smell from under the hood can be anything, and there are different kinds, to boot.