2008 Mercedes-Benz CLK350

The 2008 Mercedes-Benz CLK350 is a sleek and stylish coupe/convertible known for its elegant design and comfortable ride. The CLK350 features a 3.5-liter V6 engine producing 268 horsepower and 258 lb-ft of torque. Other engine options included the CLK550 with a 5.5L V8 and the high-performance CLK63 AMG with a 6.2L V8. All engines were paired with a 7-speed automatic transmission. Owners generally appreciate the car’s luxurious feel and refined driving experience but often cite electrical gremlins and occasional mechanical issues as drawbacks.

Engine

3.5L V6 (M272)

• Balance Shaft Sprocket Failure
  • Description/Symptoms: This is a common issue with the M272 engine produced before 2009. The balance shaft sprocket wears prematurely, leading to a check engine light, rough running, and eventual engine damage if not addressed. Symptoms include a check engine light with codes P0016, P0017, P0018, or P0019, and a rattling noise from the engine.
  • Solution: Replacing the balance shaft sprocket with an updated version. This requires significant engine disassembly.
  • Estimated Cost to Fix: $2,500 - $4,000+
  • Recalls: None Found
• Camshaft Adjuster Solenoid (Cam Magnet) Failure
  • Description/Symptoms: Malfunctioning cam magnets can cause rough idling, poor acceleration, and a check engine light.
  • Solution: Replacing the faulty cam magnet(s).
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Intake Manifold Tumbler Flap Failure
  • Description/Symptoms: The plastic flaps inside the intake manifold can break, causing a check engine light and reduced engine performance.
  • Solution: Replacing the entire intake manifold.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found

Transmission

7-Speed Automatic (722.9)

• Valve Body Issues
  • Description/Symptoms: The 722.9 transmission is known for valve body issues, leading to harsh shifting, delayed engagement, and slipping between gears.
  • Solution: Replacing or rebuilding the valve body.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Torque converter failure can cause shuddering, stalling, and poor acceleration.
  • Solution: Replacing the torque converter.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found

Suspension

• Front Control Arm Bushing Failure
  • Description/Symptoms: Worn control arm bushings can cause clunking noises, uneven tire wear, and vague steering.
  • Solution: Replacing the control arm bushings or the entire control arm assembly.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Sway Bar Link Failure
  • Description/Symptoms: Broken or worn sway bar links can cause rattling noises, especially when driving over bumps.
  • Solution: Replacing the sway bar links.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: The EIS can fail, preventing the car from starting. Common symptoms include the key not turning in the ignition or the car failing to recognize the key.
  • Solution: Replacing the EIS and potentially reprogramming it to match the car’s security system.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Issues
  • Description/Symptoms: The SAM controls various electrical functions, and failures can lead to problems with lights, wipers, power windows, and other systems.
  • Solution: Diagnosing the specific SAM module issue and potentially replacing the SAM unit.
  • Estimated Cost to Fix: $500 - $1,200+
  • Recalls: None Found
• Instrument Cluster Failure
  • Description/Symptoms: The instrument cluster can fail, resulting in inaccurate readings or a complete loss of display.
  • Solution: Repairing or replacing the instrument cluster.
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found

Exterior

• Convertible Top Hydraulic System Leaks (Convertible Models Only)
  • Description/Symptoms: Hydraulic leaks in the convertible top system can cause the top to operate slowly or fail to open/close completely.
  • Solution: Locating and repairing the leak, potentially replacing hydraulic lines or the pump.
  • Estimated Cost to Fix: $300 - $1,500+ depending on the severity of the leak and the parts needing replacement.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: The sunroof motor can fail or the sunroof mechanism can jam, preventing the sunroof from opening or closing properly.
  • Solution: Replacing the sunroof motor or repairing the sunroof mechanism.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Summary The 2008 Mercedes-Benz CLK350, while a luxurious and stylish vehicle, is prone to several common issues. The most significant concern is the balance shaft sprocket failure in the M272 engine, which can be an expensive repair. Electrical issues, particularly with the EIS and SAM modules, are also prevalent. Transmission problems, suspension wear, and convertible top issues (if applicable) can add to the overall cost of ownership. Potential buyers should be aware of these potential problems and factor in the cost of repairs when considering purchasing this vehicle. While some issues are relatively minor, others can be quite costly to fix.