2024 Mercedes-Benz SL43 AMG

The 2024 Mercedes-Benz SL43 AMG is a performance-oriented roadster featuring a turbocharged 2.0-liter inline-4 engine producing 375 horsepower and 354 lb-ft of torque, supplemented by a 48-volt mild-hybrid system. It exclusively uses a 9-speed automatic transmission. Other engine options for the 2024 SL include a 4.0-liter twin-turbo V8, offered in SL55 and SL63 trims. People generally praise the SL43 for its stylish design, agile handling, and luxurious interior. Some criticisms include the relatively high price point for the performance offered compared to competitors, and some find the ride a bit firm for a grand tourer.

Engine

2.0L Turbocharged Inline-4 (M139)

• Turbocharger Failure
  • Description/Symptoms: Loss of power, whining noise from the turbocharger, check engine light. Can sometimes be caused by oil starvation due to faulty check valve.
  • Solution: Replace the turbocharger. Inspect and replace the oil check valve to prevent future occurrences.
  • Estimated Cost to Fix: $2,500 - $4,500+
  • Recalls: None Found
• High-Pressure Fuel Pump (HPFP) Failure
  • Description/Symptoms: Engine misfires, rough idling, stalling, check engine light.
  • Solution: Replace the high-pressure fuel pump.
  • Estimated Cost to Fix: $1,500 - $2,500
  • Recalls: None Found

Transmission

9-Speed Automatic (9G-TRONIC)

• Rough Shifting/Hesitation
  • Description/Symptoms: Harsh upshifts and downshifts, particularly between lower gears. Hesitation or delay when accelerating, especially from a stop.
  • Solution: A software update or a full transmission replacement.
  • Estimated Cost to Fix: $200 - $500 (Software Update), $7,000 - $10,000+ (Transmission Replacement)
  • Recalls: None Found

Suspension

• Air Suspension Failure (If Equipped with Optional Air Suspension)
  • Description/Symptoms: Vehicle sagging on one or more corners, air compressor running constantly, “Vehicle Level Too Low” warning message.
  • Solution: Replace the faulty air strut(s) or air compressor. Inspect and repair any leaks in the air lines.
  • Estimated Cost to Fix: $1,500 - $3,000+ per strut, $800 - $1,500+ for the compressor
  • Recalls: None Found

Electrical

• Infotainment System Issues
  • Description/Symptoms: System freezing, crashing, slow response times, Bluetooth connectivity problems, navigation errors.
  • Solution: Software update, replacement of the infotainment unit.
  • Estimated Cost to Fix: $0 - $500 (Software Update), $1,500 - $3,000+ (Unit Replacement)
  • Recalls: None Found
• Sensor Malfunctions (Parking Sensors, Blind Spot Monitoring, etc.)
  • Description/Symptoms: False alarms, inaccurate readings, system not functioning at all.
  • Solution: Diagnose the faulty sensor and replace it.
  • Estimated Cost to Fix: $300 - $800+ per sensor
  • Recalls: None Found

Exterior

• Convertible Top Malfunctions
  • Description/Symptoms: Top failing to open or close completely, unusual noises during operation, error messages on the instrument cluster.
  • Solution: Diagnose the issue and repair or replace the hydraulic pump, cylinders, or sensors.
  • Estimated Cost to Fix: $500 - $3,000+ depending on the specific component.
  • Recalls: None Found

Interior

• Seat Motor/Adjustment Problems
  • Description/Symptoms: Seat not moving in one or more directions, clicking noises, failure of lumbar support or massage functions.
  • Solution: Replace the faulty seat motor or adjustment mechanism.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Summary

The 2024 Mercedes-Benz SL43 AMG, while offering a luxurious experience, exhibits some potential issues. Engine-related problems, particularly with the turbocharger and high-pressure fuel pump, could lead to significant repair costs. Transmission issues such as rough shifting may also arise. Electrical and infotainment glitches along with sensor failures could require attention. Owners should be aware of these potential issues and consider extended warranties or thorough inspections when purchasing a used model.