Failed spark plug wires and/or ignition coils can cause intermittent misfires (rough running); the Check Engine Light may also illuminate. Diagnoses of the ignition system will be necessary to determine which components are at fault.
Car problem reports
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Most reported 2003 Mercedes-Benz CLK320 problems
A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the climate control system. Disassembly of the center console will be required to access and change the broken arm with the updated, reinforced part.
The sway bar end link joints may wear and cause a knocking noise over bumps. Loose or warn links should be replaced to correct this type of noise.
The heating, ventilation and AC (HVAC) heater box is susceptible to mildew buildup. This can result in a musty odor from the HVAC system, most noticeable when the system is first turned on.
Ball joints can wear out prematurely, causing wear in the tires.
At certain low speeds the car felt like it was jerking, as if it were constantly downshifting. At other times I felt a rumbling, as though I were driving over a rough rode. It turned out to be a bad torque converter, and I had to have the transmission rebuilt. I also replaced the radiator (Valeo) which are known to fail and leak coolant into the transmission, causing the torque converter to fail. Valeo radiators were used in early 2004 mod...