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In 2003, the Mercedes-Benz C240 is known for having more electrical problems than mechanical issues. The car is generally well-built, but common electrical glitches include the instrument cluster display fading, the sunroof not retracting automatically, and headlights remaining on. These issues are typically minor and not major concerns. Some other common problems are the blower stepper motor making clicking sounds and the crankshaft position sensor failing, although these are not unique to the C240 model. Like many Mercedes-Benz vehicles, rust can be a common issue, so it may be wise to invest in additional rust protection for this car.
Several issues with the 2003 Mercedes Benz C240 have been noted, including problems with the crankshaft sensor failing and worn sway bar links.