2019 Mercedes-Benz CLS450

The 2019 Mercedes-Benz CLS450 is a sleek and stylish four-door coupe, known for its luxurious interior and comfortable ride. The CLS450 is powered by a 3.0-liter inline-6 turbocharged engine with EQ Boost, producing 362 horsepower and 369 lb-ft of torque. A 9-speed automatic transmission is standard. Other available engines in the 2019 CLS lineup included an AMG-enhanced 3.0L inline-6 turbo (CLS53) and a 2.0L inline-4 turbo (CLS300d available in some markets). Owners often praise the car’s elegant design, refined driving experience, and advanced technology features. Common dislikes include the relatively limited rear headroom due to the sloping roofline and the complexity of the infotainment system.

Engine

3.0L Inline-6 Turbocharged with EQ Boost

• Engine Misfires
  • Description/Symptoms: Engine misfires, rough idling, check engine light illumination. Often related to faulty ignition coils or spark plugs.
  • Solution: Replacement of faulty ignition coils and/or spark plugs.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• EQ Boost System Malfunction
  • Description/Symptoms: Issues with the 48V mild-hybrid system. This can lead to the vehicle not starting, reduced power, or error messages related to the EQ Boost system on the dashboard.
  • Solution: Diagnosis of the EQ Boost system components (e.g., integrated starter generator (ISG), 48V battery, control modules) and replacement of the faulty parts. Software updates to the EQ Boost system’s control module may also be necessary.
  • Estimated Cost to Fix: $500 - $3000+ (depending on the component that needs replacing)
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic

• Rough or Delayed Shifting
  • Description/Symptoms: Hesitation when shifting gears, especially during acceleration or deceleration. Jerky or abrupt shifts.
  • Solution: Software update of the transmission control module (TCM). If the problem persists, a transmission flush and filter change may be necessary. In some cases, valve body replacement is required.
  • Estimated Cost to Fix: $150 (software update) - $3000+ (valve body replacement)
  • Recalls: None Found

Suspension

• Air Suspension Issues (if equipped)
  • Description/Symptoms: Vehicle leaning to one side, compressor failure, error messages related to the air suspension system. The car might feel unstable or ride roughly.
  • Solution: Replacement of faulty air struts, air compressor, or ride height sensors. Leak detection and repair in the air lines are also necessary.
  • Estimated Cost to Fix: $800 - $3000+ (depending on the component)
  • Recalls: None Found

Electrical

• Infotainment System Freezing/Crashing
  • Description/Symptoms: The MBUX infotainment system may freeze, crash, or become unresponsive. This can affect navigation, audio, and other vehicle functions.
  • Solution: Software update of the MBUX system. In some cases, a complete system reset or replacement of the infotainment unit may be required.
  • Estimated Cost to Fix: $0 (software update) - $1500+ (unit replacement)
  • Recalls: None Found
• Sensor Malfunctions (Parking Sensors, Blind Spot Monitoring, etc.)
  • Description/Symptoms: False alarms, intermittent failures, or complete failure of the parking sensors, blind spot monitoring system, or other driver-assistance systems.
  • Solution: Diagnosis of the affected sensors and wiring. Replacement of faulty sensors. Recalibration of the driver-assistance systems after sensor replacement.
  • Estimated Cost to Fix: $200 - $800+ per sensor
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Sunroof/Moonroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, unusual noises when operating the sunroof, water leaks.
  • Solution: Inspection and lubrication of the sunroof tracks and mechanism. Replacement of faulty sunroof motor or seals.
  • Estimated Cost to Fix: $200 - $1000+
  • Recalls: None Found
• Seat Motor Issues
  • Description/Symptoms: Electric seat malfunctioning or making strange noises when adjusting.
  • Solution: Seat Motor Replacement
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Summary

The 2019 Mercedes-Benz CLS450, while offering a luxurious experience, exhibits some common issues, particularly with the EQ Boost system, transmission, infotainment system, and (if equipped) air suspension. Repairs can range from relatively inexpensive software updates to costly component replacements. Potential buyers should be aware of these potential issues and consider a pre-purchase inspection by a qualified mechanic familiar with Mercedes-Benz vehicles. The severity of the issues varies, but addressing them promptly is crucial to maintaining the vehicle’s performance and reliability.