2003 Mercedes-Benz CLK55 AMG

The 2003 Mercedes-Benz CLK55 AMG is a performance-oriented coupe and convertible powered by a hand-built 5.4L naturally aspirated V8 engine producing 362 horsepower and 376 lb-ft of torque. It was only offered with a 5-speed automatic transmission. Drivers appreciate the car’s powerful engine, comfortable ride, and luxurious interior, but common complaints include higher maintenance costs, age-related issues, and electrical gremlins.

Engine

5.4L M113 V8

• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks from the valve cover gaskets onto the exhaust manifolds, causing a burning smell. Visible oil residue around the valve covers.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: None Found
• Crankshaft Position Sensor Failure
  • Description/Symptoms: Engine stalling, rough running, or failure to start. Diagnostic trouble codes (DTCs) related to crankshaft position sensor.
  • Solution: Replace the crankshaft position sensor.
  • Estimated Cost to Fix: $150 - $300+
  • Recalls: None Found
• Purge Valve Failure
  • Description/Symptoms: A failed purge valve may cause the engine to run rough or have a hard time starting.
  • Solution: Replace the purge valve.
  • Estimated Cost to Fix: $100 - $200+
  • Recalls: None Found

Transmission

5-Speed Automatic (722.6)

• Conductor Plate Failure
  • Description/Symptoms: Erratic shifting, getting stuck in gear, or transmission going into “limp mode.” Diagnostic trouble codes related to the transmission.
  • Solution: Replace the conductor plate and filter. Consider replacing the electrical connector as well.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Harsh shifting, slipping between gears, or delayed engagement.
  • Solution: Valve body rebuild or replacement.
  • Estimated Cost to Fix: $1000 - $2500+
  • Recalls: None Found

Suspension

• Air Suspension Issues (If Equipped - primarily convertibles)
  • Description/Symptoms: Car sitting unevenly, compressor running constantly, suspension failure warning lights. Leaks in air struts or lines.
  • Solution: Replace leaking air struts, repair or replace air compressor, address leaks in air lines.
  • Estimated Cost to Fix: $800 - $2000+ per strut, $500 - $1000+ for compressor.
  • Recalls: None Found
• Ball Joint and Bushing Wear
  • Description/Symptoms: Clunking or squeaking noises from the suspension, loose steering, uneven tire wear.
  • Solution: Replace worn ball joints and bushings.
  • Estimated Cost to Fix: $300 - $800+ per corner.
  • Recalls: None Found

Electrical

• Instrument Cluster Pixelation
  • Description/Symptoms: Pixels disappearing or fading on the instrument cluster display, making it difficult to read information.
  • Solution: Repair or replace the instrument cluster.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Window Regulator Failure
  • Description/Symptoms: Windows failing to go up or down, or making grinding noises during operation.
  • Solution: Replace the window regulator.
  • Estimated Cost to Fix: $300 - $600+ per window.
  • Recalls: None Found
• Keyless Entry Issues
  • Description/Symptoms: Key fob not working, difficulty locking or unlocking the car, or alarm system malfunctions.
  • Solution: Replace key fob batteries, reprogram key fob, or replace faulty door lock actuators.
  • Estimated Cost to Fix: $50 - $500+ depending on the issue.
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust on door panels, quarter panels, and wheel wells
  • Solution: Cut out damaged panel and replace with fresh metal
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2003 Mercedes-Benz CLK55 AMG, while a powerful and luxurious vehicle, is prone to several age-related issues. The most common problems revolve around the engine (leaks, sensor failures), transmission (conductor plate, valve body), suspension (air suspension issues if equipped, ball joint/bushing wear), and electrical systems (pixelated displays, window regulators). The severity and cost of these repairs can vary greatly. Transmission and suspension repairs tend to be the most expensive, while engine and electrical repairs can range from relatively minor to significant expenses. Prospective buyers should be aware of these potential issues and factor them into their purchase and maintenance budget.