Computer control modules for the seats and doors, the CD changer, and the brake lamp switch tend to fail.
Resources for the Repair and Maintenance of your 2004 Mercedes-Benz CLK500
2004 Mercedes-Benz CLK500
2004 Mercedes-Benz CLK500 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 electrical connector at the automatic transmission may leak fluid into the wiring harness. If not repaired, the oil will migrate through the wiring harness and damage the transmission control module. At that point, a new harness and control module may be necessary to correct this problem.
The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance. Communicating these specific symptoms to your technician can save diagnostic time.
Going over large bumps in convertible models may cause the roll bar to deploy, rendering the roof inoperative. Special tools are generally required to return the roll bar to its stowed position.
2004 Mercedes-Benz CLK500 Recalls (Recent)
RepairPal Expert Overview:
Some seat belt buckles may have a burr on a metal component of the locking mechanism. This could prevent the seat belt from locking under certain conditions. In the event of a crash, the seat occupant may not be properly restrained, increasing the risk of injury. Dealers will replace the affected seat belts. This recall is expected to begin on December 22, 2003. The Mercedes-Benz recall number is 2003 120006.
RepairPal Expert Overview:
There is a faulty software calibration that affects several areas including shutting off the fuel supply in a collision. This could cause a fire hazard during an accident. Dealers will reprogram this software. The Mercedes-Benz recall number is 2008 070001. This recall began during August, 2008.
2004 Mercedes-Benz CLK500 Questions and Answers
what is included in service A and how much should it cost? at a dealer? at an independent
The line on the radiator came off and all the fluid came out the car would not move. we added 9 quarts and the car will only move when it is reved. How many quarts does the trans hold if we lost it...
how long should a shop charge for replacing 2 control arms?
Looking for instructions on removing and replacing the lighter assembly in the center console. Do you have to take the console apart or will the assembly just pull out?
2004 Mercedes-Benz CLK500 Reviews
I have own the coupe for 5+ years w/106k miles.
Under factory warranty repair, Key fob transmitter replaced, Passenger side seat control unit replace, Valve cover gasket replaced, 3rd brake light fell off from slamming the trunk to hard, (16) Spark plug and wire due to vehicle shakiness (did not solve it), Exhaust manifolds replace due to vehicle shakiness (did not solve it)
Not under factory warranty repair.
A/C Flap Actuator (stepper motor), Transmission front seal, Bump stop, Serpentine belt, Pulley replace (forgot witch one), 3rd brake (stop working), Crankshaft sensor was replace at 50k miles, Upper and lower control arm, Drive shaft flex plate
Front brakes replace every 2 years, Rear brakes Never changed them
I did the transmission fluid with new filter/gasket at 95k miles.
I still have to do the following maintenance.
(16) Spark plugs, wires, coil pack (I have the parts)
Power steering fluid, Coolant fluid, Brake fluid, Bushing due to squeaking suspension......
The vehicle shakes a little while idling. I'm changing all (8) coil packs and hope it will solve it. Wiper blades you have to go thru Mercedes.
This car is an electical piece of cr*p. Its had all kinds of electrical issues - sensors going bad, SRS light always coming on when its not supposed to, warning that lights are out when they are not, etc. Ah, and the CD changer broke at 45,000 miles. I can't believe how much time and energy I've had to waste on this thing. Its my first and last Mercedes.
That said, no engine problems or AC or exhaust problems of any kind. The AC controls are ridiculous though, a total pain to operate.
That said, the interior is great (except for some premature yellowing of hard plastic around the door latches on the inside and some peeling of the brightwork around the vents)
It drives well and has great engine sound, good pickup for a super heavy car (the convertible I think is like 5000 lbs).
I bought it 3 years old and the steering wheel leather was all worn and nasty, got that replaced for $800, Mercedes would not cover it under warranty.
I've heard Mercedes quality has improved, I hope so. I've had more problems in 2 years with this car than I had in 10 years with a Geo, Ford and Saab.