2007 Mercedes-Benz CLS350

The 2007 Mercedes-Benz CLS350 is a stylish four-door coupe known for its sleek design and luxurious features. Other engine options available were the CLS500 and CLS55 AMG. The CLS350 features a 3.5-liter V6 engine producing around 268 horsepower and 258 lb-ft of torque. Many owners appreciate its comfortable ride and elegant interior, while some common complaints include electrical issues and the cost of maintenance.

Engine

3.5L V6 (M272)

• Balance Shaft Sprocket Wear
  • Description/Symptoms: Ticking or rattling noise from the engine, especially on startup. Check engine light may illuminate with codes related to camshaft timing. This is a very common issue on early M272 engines.
  • Solution: Replacement of the balance shaft, which requires significant engine disassembly.
  • Estimated Cost to Fix: $2,000 - $4,000+
• Camshaft Adjuster Solenoids
  • Description/Symptoms: Rough idling, decreased engine performance, and a check engine light.
  • Solution: Replacing the faulty camshaft adjuster solenoid(s).
  • Estimated Cost to Fix: $200 - $600+ per solenoid.
• Intake Manifold Runner Flap Motor Failure
  • Description/Symptoms: Check engine light, poor engine performance, and possible whistling noise.
  • Solution: Replacement of the intake manifold runner flap motor or the entire intake manifold assembly.
  • Estimated Cost to Fix: $500 - $1,500+

Transmission

7G-Tronic (722.9)

• Conductor Plate Failure
  • Description/Symptoms: Erratic shifting, getting stuck in gear, transmission not shifting at all, or displaying a “limp mode.” Diagnostic codes will often point to conductor plate malfunctions.
  • Solution: Replacement of the conductor plate, which is located inside the transmission.
  • Estimated Cost to Fix: $800 - $1,500+
• Valve Body Issues
  • Description/Symptoms: Harsh shifting, slipping between gears, delayed engagement, or failure to shift.
  • Solution: Rebuilding or replacing the valve body.
  • Estimated Cost to Fix: $1,000 - $2,500+

Suspension

• Airmatic Suspension Leaks (if equipped)
  • Description/Symptoms: Vehicle sagging on one or more corners, failure to maintain ride height, and the air compressor running constantly.
  • Solution: Replacing leaking air struts or air lines.
  • Estimated Cost to Fix: $800 - $2,000+ per strut. Replacing air lines can cost a few hundred.
• Airmatic Compressor Failure (if equipped)
  • Description/Symptoms: Vehicle sagging, warning lights on the dash, compressor failing to turn on or running weakly.
  • Solution: Replacing the Airmatic compressor.
  • Estimated Cost to Fix: $500 - $1,200+

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not being recognized, inability to start the car, and potential locking of the steering wheel.
  • Solution: Replacement of the EIS module and potentially reprogramming.
  • Estimated Cost to Fix: $800 - $1,800+
• SAM (Signal Acquisition Module) Issues
  • Description/Symptoms: Malfunctions with various electrical components, such as lights, wipers, or windows. This can be due to water intrusion or electrical overload.
  • Solution: Diagnosis to determine the specific faulty SAM unit (front or rear) and replacement.
  • Estimated Cost to Fix: $500 - $1,500+
• Battery Drain
  • Description/Symptoms: Car battery draining overnight or within a few days, requiring frequent jump starts.
  • Solution: Identification and repair of the parasitic drain, which can involve tracing circuits and testing various components.
  • Estimated Cost to Fix: $200 - $1,000+ (depending on the complexity of the issue).

Exterior

• Door Lock Actuator Failure
  • Description/Symptoms: Door not locking or unlocking properly with the key fob or central locking system.
  • Solution: Replacement of the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $500+ per door.

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof failing to open or close properly, sticking, or making unusual noises.
  • Solution: Repair or replacement of the sunroof motor, tracks, or other components.
  • Estimated Cost to Fix: $300 - $1,000+

Summary

The 2007 Mercedes-Benz CLS350 presents a mix of potential issues that owners should be aware of. Engine problems such as balance shaft wear can be costly. Transmission issues related to the conductor plate and valve body are also frequent and expensive. Electrical faults involving the EIS and SAM modules also pose significant concerns. Suspension problems, specifically with the Airmatic system if equipped, adds another layer of potential repair expenses. Overall, the CLS350, while stylish and luxurious, can be prone to high maintenance costs due to these common issues.