One problem related to headlights has been reported for the 2003 Mercedes Benz C230. The most recently reported issues are listed below.
1. The headlight cannot be turn on as I drove into a 1-mile dark tunnel in us west. 2. It persists for about 1-days during a trip to the us west in the dry heat environment. After that, the headlight work normal again as I came back to California. 3. Nothing has being done since then since I will probably not drive to us west in the visible near future. The old parts are still available in my car.