2004 Mercedes-Benz CLK500

The 2004 Mercedes-Benz CLK500 is a luxury coupe/convertible equipped with a 5.0L V8 engine producing 302 horsepower and 339 lb-ft of torque. Other engine options for the 2004 CLK included a 3.2L V6 (CLK320) and a supercharged 5.4L V8 (CLK55 AMG). All engines were paired with a 5-speed automatic transmission. Owners often praise the CLK500 for its smooth ride, powerful engine, and elegant styling. Common dislikes include electrical issues, reliability concerns, and the cost of maintenance.

Engine

5.0L V8 (M113)

• Oil Leaks
  • Description/Symptoms: Oil leaks are common from various locations, including the valve cover gaskets, oil pan gasket, and front crankshaft seal. Symptoms include visible oil leaks, oil consumption, and burning oil smell.
  • Solution: Replace the leaking gaskets or seals.
  • Estimated Cost to Fix: $200 - $800+ depending on the location and severity of the leak.
  • Recalls: None Found
• Idler Pulley Failure
  • Description/Symptoms: The idler pulley can fail, causing noise, vibration, and potentially damage to the serpentine belt.
  • Solution: Replace the idler pulley.
  • Estimated Cost to Fix: $100 - $300
  • Recalls: None Found
• Camshaft Position Sensor Failure
  • Description/Symptoms: Can cause rough running, poor fuel economy, and a check engine light.
  • Solution: Replace the camshaft position sensor.
  • Estimated Cost to Fix: $150 - $350
  • Recalls: None Found

Transmission

5-Speed Automatic (722.6)

• Conductor Plate Failure
  • Description/Symptoms: The conductor plate inside the transmission can fail, leading to erratic shifting, limp mode, and difficulty shifting gears.
  • Solution: Replace the conductor plate and filter, and perform a transmission fluid flush.
  • Estimated Cost to Fix: $600 - $1200+
  • Recalls: None Found
• Slipping/Harsh Shifting
  • Description/Symptoms: Transmission may slip between gears or shift harshly. This can be caused by low fluid, worn clutches, or valve body issues.
  • Solution: Check fluid level, perform a transmission fluid flush, or rebuild/replace the transmission.
  • Estimated Cost to Fix: $100 (fluid check) to $3000+ (rebuild/replacement)
  • Recalls: None Found

Suspension

• Control Arm Bushing Failure
  • Description/Symptoms: Worn control arm bushings can cause clunking noises, poor handling, and uneven tire wear.
  • Solution: Replace the control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $200 - $600+ per control arm.
  • Recalls: None Found
• Ball Joint Failure
  • Description/Symptoms: Similar to control arm bushings, worn ball joints can lead to noise, poor handling, and safety concerns.
  • Solution: Replace the ball joints.
  • Estimated Cost to Fix: $150 - $400+ per ball joint.
  • Recalls: None Found

Electrical

• Instrument Cluster Pixel Failure
  • Description/Symptoms: Pixels on the instrument cluster display can fade or disappear, making it difficult to read information.
  • Solution: Repair or replace the instrument cluster.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• Window Regulator Failure
  • Description/Symptoms: The window regulator can fail, causing the window to become stuck or operate erratically.
  • Solution: Replace the window regulator.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door locks may fail to lock or unlock properly.
  • Solution: Replace the door lock actuator.
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: Sunroof may get stuck, make noises, or leak.
  • Solution: Clean and lubricate the tracks, repair or replace the motor or regulator.
  • Estimated Cost to Fix: $100 - $600+
  • Recalls: None Found

Exterior

• Convertible Top Issues (Convertible Models Only)
  • Description/Symptoms: The convertible top mechanism can malfunction, leading to difficulty opening or closing the top. This can be due to hydraulic leaks, sensor failures, or motor issues.
  • Solution: Diagnose and repair the specific issue. This may involve replacing hydraulic cylinders, sensors, or the motor.
  • Estimated Cost to Fix: $300 - $2000+ depending on the issue.
  • Recalls: None Found

Interior

• Climate Control Issues
  • Description/Symptoms: Problems with the climate control system, such as failure to blow cold air, inconsistent temperatures, or blower motor malfunctions.
  • Solution: Diagnose and repair the specific issue, which may involve recharging the refrigerant, replacing the compressor, blower motor, or other components.
  • Estimated Cost to Fix: $200 - $1000+ depending on the issue.
  • Recalls: None Found

Summary

The 2004 Mercedes-Benz CLK500, while a stylish and enjoyable vehicle, does suffer from several common issues. Engine oil leaks, transmission conductor plate failures, and electrical problems are among the most frequently reported. Repair costs can range from a few hundred dollars for minor fixes to several thousand dollars for major repairs like transmission work or convertible top system repairs. Potential buyers should be aware of these issues and have the vehicle inspected by a qualified mechanic before purchasing.