What are some of the 2003 mercedes benz c240 problems?

The typical problems You're going to encounter on the 2003 Mercedes-Benz C240 are going to be of the electrical variety, rather than mechanical. For the latter, the C240 has a reputation of being very well built. So with the electrical, things You'll encounter are the display on the instrument cluster just fading out, the sunroof not automatically retracting as it should, and headlights which don't turn off. There are other small irritating issues like that; nothing earthshaking, usually. There are other common failures, like the blower stepper motor making clicking noises, and the crankshaft position sensor dying, but those aren't specific to the C240. Though, like many Mercedes-Benzes, You will likely encounter the infamous rust issue, so this is a vehicle where the additional coating's going to be worthwhile.