2009 Mercedes-Benz CLK350

The 2009 Mercedes-Benz CLK350 is a stylish and comfortable coupe/convertible known for its elegant design and smooth driving experience. It’s powered by a 3.5L V6 engine producing 268 horsepower and 258 lb-ft of torque, paired with a 7-speed automatic transmission. Some owners appreciate its refined ride and luxurious interior, while others find the maintenance costs to be high and the rear seat space limited. Other available engine options include the CLK550 featuring a 5.5L V8 and the high-performance CLK63 AMG with a 6.2L V8 engine.

Engine

3.5L V6

• Camshaft Adjuster Solenoid Failure
  • Description/Symptoms: Engine misfires, rough idle, check engine light. Often related to codes P0016 or P0017.
  • Solution: Replacement of the faulty camshaft adjuster solenoid.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Oil Leaks (Valve Cover Gaskets)
  • Description/Symptoms: Oil leaking onto exhaust components, burning smell, low oil level.
  • Solution: Replacement of valve cover gaskets.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found

Transmission

7-Speed Automatic (722.9)

• Conductor Plate Failure
  • Description/Symptoms: Erratic shifting, getting stuck in gear, inability to shift, limp mode. Fault codes often present related to solenoids or speed sensors.
  • Solution: Replacement of the conductor plate inside the transmission.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found

Suspension

• Front Suspension Ball Joint Wear
  • Description/Symptoms: Clunking noises from the front suspension, especially when going over bumps. Loose steering.
  • Solution: Replacement of worn ball joints.
  • Estimated Cost to Fix: $300 - $800+ (per side, depending on labor)
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, inability to start the car, intermittent starting issues.
  • Solution: Replacement of the EIS module.
  • Estimated Cost to Fix: $800 - $2000+ (requires programming)
  • Recalls: None Found
• SAM (Signal Acquisition Module) Issues
  • Description/Symptoms: Malfunctions of various electrical components such as lights, wipers, power windows, or door locks. Can be caused by water intrusion.
  • Solution: Diagnosis to determine the affected SAM (front or rear) and repair or replacement.
  • Estimated Cost to Fix: $500 - $1500+
  • Recalls: None Found

Exterior

• Rust (Wheel Arches/Door Bottoms)
  • Description/Symptoms: Surface rust appearing on wheel arches and/or along the bottom edges of the doors.
  • Solution: Repair or replacement of rusted panels, followed by paint.
  • Estimated Cost to Fix: $500 - $2000+ (per panel, depending on severity and repair method)
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, or making excessive noise.
  • Solution: Repair or replacement of sunroof motor, tracks, or cables.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found

Summary

The 2009 Mercedes-Benz CLK350 can be a rewarding vehicle to own, but it’s essential to be aware of the potential issues. Engine issues such as camshaft adjuster solenoid failure and oil leaks can arise, as well as transmission problems like conductor plate failure. Electrical problems with the EIS and SAM modules can also occur. Rust is a common issue that should be addressed promptly. Suspension and sunroof problems can also be frustrating. The cost of repairs can vary significantly depending on the specific issue and the repair shop, but owners should be prepared for potentially high maintenance expenses.