2020 Mercedes-Benz S450

The 2020 Mercedes-Benz S450 is a luxury sedan renowned for its opulent interior, smooth ride, and advanced technology. It primarily comes with a 3.0L turbocharged inline-6 engine producing 362 horsepower and 369 lb-ft of torque. Other engine options available in the S-Class for 2020 include the S560 with a 4.0L V8 and the AMG S63 with a hand-built 4.0L V8. All configurations are paired with a 9G-TRONIC 9-speed automatic transmission. Owners generally praise the S450 for its comfort, quiet cabin, and sophisticated features. Common dislikes often revolve around the complexity of the infotainment system and the potential for expensive repairs, especially with the advanced technology features.

Engine

3.0L Turbocharged Inline-6 (M256)

• Auxiliary Coolant Pump Failure
  • Description/Symptoms: The auxiliary coolant pump, responsible for cooling the turbocharger after the engine is turned off, can fail. Symptoms include a warning light, overheating after shutdown, and potentially turbocharger damage.
  • Solution: Replacement of the auxiliary coolant pump.
  • Estimated Cost to Fix: $300 - $600
• Oil Leaks from Valve Cover Gasket
  • Description/Symptoms: Oil can leak from the valve cover gasket, leading to a burning smell, visible oil on the engine, and potentially low oil levels.
  • Solution: Replacement of the valve cover gasket.
  • Estimated Cost to Fix: $200 - $400

Transmission

9G-TRONIC 9-Speed Automatic (725.0)

• Rough or Delayed Shifting
  • Description/Symptoms: Some owners have reported rough or delayed shifts, particularly between lower gears. This can manifest as a noticeable jerk or hesitation during acceleration.
  • Solution: In some cases, a software update can resolve the issue. In more severe cases, valve body replacement or full transmission replacement may be necessary.
  • Estimated Cost to Fix: $200 (software update) - $5000+ (transmission replacement)

Suspension

• Air Suspension Malfunctions (AIRMATIC)
  • Description/Symptoms: The AIRMATIC air suspension system can experience leaks or compressor failures, leading to uneven ride height, a harsh ride, or the vehicle not raising properly.
  • Solution: Diagnosis to identify the leaking component (air strut, air line, or valve block) or compressor. Replacement of the faulty part.
  • Estimated Cost to Fix: $800 - $2500+ per strut. Compressor replacement can be similar.

Electrical

• Infotainment System Freezing or Rebooting
  • Description/Symptoms: The MBUX infotainment system can sometimes freeze, lag, or unexpectedly reboot. This can affect navigation, audio, and other vehicle functions.
  • Solution: Software updates are often released to address these issues. In some cases, a full system reset or replacement of the infotainment control unit may be required.
  • Estimated Cost to Fix: $0 (software update) - $1500+ (control unit replacement)
• Battery Drain Issues
  • Description/Symptoms: Owners have reported excessive battery drain, especially if the vehicle is not driven frequently. This can result in a dead battery or difficulty starting the car.
  • Solution: Diagnosis to identify the parasitic drain. Common causes include faulty modules, improperly shut off systems, or a failing battery. Replacement of the battery or repair of the faulty component.
  • Estimated Cost to Fix: $300 - $500+ (battery replacement), Diagnostic fee may be required.

Exterior

• Sunroof Issues (Sticking or Failing to Close)
  • Description/Symptoms: The sunroof can sometimes stick or fail to close completely, potentially due to debris in the tracks or a malfunctioning motor.
  • Solution: Cleaning and lubricating the sunroof tracks. In more severe cases, replacement of the sunroof motor or mechanism may be necessary.
  • Estimated Cost to Fix: $100 - $800+

Interior

• Malfunctioning Seat Controls
  • Description/Symptoms: The multi-contour seat controls can sometimes fail, preventing adjustment of the seat position, lumbar support, or massage functions.
  • Solution: Diagnosis to identify the faulty component (switch, motor, or control module). Replacement of the faulty part.
  • Estimated Cost to Fix: $200 - $800+

Recalls

• NHTSA Recall Number: 21V-505
  • Description: Rearview camera software issue.
• NHTSA Recall Number: 21V-143
  • Description: Emergency call system may transmit incorrect location information to emergency responders.

Summary

The 2020 Mercedes-Benz S450, while a luxurious and comfortable vehicle, is prone to some common issues. The most frequently reported issues revolve around the electrical system, particularly the infotainment system, and air suspension malfunctions. Engine and transmission issues are less common but can still occur. Repair costs can vary widely depending on the specific issue and the required parts and labor. Overall, the potential for expensive repairs, particularly with the advanced technology features, should be a consideration for potential buyers. Severity ranges from minor inconveniences (infotainment glitches) to more significant problems (suspension or transmission issues) that can impact the vehicle’s reliability and driving experience.