One problem related to door has been reported for the 2003 Mercedes Benz 240. The most recently reported issues are listed below.
The driver and passenger side door handles on the inside broke on my 2003 mercedes-benz c240 4matic when I simply went to the open the door. I had to super glue them back on so I could get out of the car. It is not covered under the warranty because it is considered "cosmetic" damage.