The switch for the vanity mirror light above the sun visor fail; there is an updated switch for some models. On the remaining models, due to a redesign, the mirror "cassette" will need replacement.
Car Problem Reports
Mercedes-Benz E430 Switch For Vanity Mirror Light Above Sun Visor May Fail
Mercedes-Benz E430 Problem
Average Mileage: 102,500 mi (58,000 mi - 147,000 mi)