2018 Mercedes-Benz CLS400

Introduction

The 2018 Mercedes-Benz CLS400 is a four-door luxury sedan known for its sleek design, powerful engine, and advanced technology. It is powered by a 3.0-liter twin-turbocharged V6 engine that produces 362 horsepower and 369 lb-ft of torque, paired with a nine-speed automatic transmission. The CLS400 is praised for its comfortable ride, responsive handling, and impressive fuel economy, but some owners have reported issues with various components.

Engine

3.0L Twin-Turbocharged V6

• Fuel Injectors Failure
  • Description/Symptoms: Engine misfires, rough idling, power loss
  • Solution: Replace faulty fuel injectors
  • Estimated Cost to Fix: $600 - $1,200+
  • Recalls: 2020-607
• Valve Cover Gasket Leak
  • Description/Symptoms: Oil leak from under the valve cover
  • Solution: Replace valve cover gasket
  • Estimated Cost to Fix: $300 - $700+
• Thermostat Failure
  • Description/Symptoms: Engine overheating, coolant level drops
  • Solution: Replace thermostat
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Transmission

Nine-Speed Automatic

• Shifting Issues
  • Description/Symptoms: Hesitation or jerking during gear changes
  • Solution: Update transmission software or perform transmission fluid exchange
  • Estimated Cost to Fix: $200 - $600+
• Transmission Slipping
  • Description/Symptoms: Loss of power or difficulty accelerating
  • Solution: Repair or replace transmission
  • Estimated Cost to Fix: $2,000 - $4,000+

Suspension

• Air Suspension Compressor Failure
  • Description/Symptoms: Vehicle sagging on one side, reduced ride height
  • Solution: Replace air suspension compressor
  • Estimated Cost to Fix: $1,000 - $2,000+
• Strut Mount Bearing Failure
  • Description/Symptoms: Noises from the suspension, uneven tire wear
  • Solution: Replace strut mount bearings
  • Estimated Cost to Fix: $400 - $800+

Electrical

• Battery Discharge
  • Description/Symptoms: Battery drains quickly, difficulty starting the vehicle
  • Solution: Diagnose and fix the underlying electrical issue
  • Estimated Cost to Fix: Varies depending on the issue
• Remote Key Fob Malfunction
  • Description/Symptoms: Fob buttons not working, intermittent locking/unlocking issues
  • Solution: Replace remote key fob
  • Estimated Cost to Fix: $200 - $400+

Exterior

• Headlight Condensation
  • Description/Symptoms: Moisture inside the headlight assembly
  • Solution: Seal the headlight assembly
  • Estimated Cost to Fix: $200 - $400+
• Chrome Trim Peeling
  • Description/Symptoms: Decorative chrome trim on the exterior peeling or flaking
  • Solution: Replace or repaint the affected trim
  • Estimated Cost to Fix: $400 - $800+

Interior

• Navigation System Crashing
  • Description/Symptoms: Navigation system freezes, reboots, or displays incorrect information
  • Solution: Update navigation software or replace the navigation unit
  • Estimated Cost to Fix: $400 - $1,000+
• Multifunction Steering Wheel Buttons Not Working
  • Description/Symptoms: Buttons on the steering wheel not responding or functioning erratically
  • Solution: Replace the multifunction steering wheel module
  • Estimated Cost to Fix: $500 - $1,000+

Summary

The 2018 Mercedes-Benz CLS400 is generally a reliable vehicle, but some owners have reported issues with certain components. While some issues, such as fuel injector failure and headlight condensation, are relatively minor and inexpensive to fix, others, like transmission slipping and air suspension compressor failure, can be more severe and costly. Overall, the cost of repairs can range from a few hundred dollars to several thousand dollars depending on the issue and the extent of damage. It is important to have the vehicle inspected by a qualified mechanic if you experience any problems.