2016 Mercedes-Benz S400L

The 2016 Mercedes-Benz S400L is a luxury sedan known for its smooth ride, opulent interior, and advanced technology. This model year offered a blend of comfort and performance, making it a desirable vehicle for many. The S400L specifically features a 3.0L Turbocharged V6 engine producing 329 horsepower and 354 lb-ft of torque. Other engine options available for the 2016 S-Class range included V8 and V12 engines, as well as a hybrid powertrain. The transmission across the S400L range is the 7G-TRONIC PLUS 7-speed automatic. Owners typically praise the S400L for its comfortable seats, quiet cabin, and advanced safety features. Common dislikes include the complexity of the infotainment system and the potential for expensive repairs.

Engine

3.0L Turbocharged V6

• Oil Leaks
  • Description/Symptoms: Oil leaks are reported from various engine seals and gaskets, including the valve cover gaskets and oil filter housing. Symptoms include visible oil drips under the car, a burning oil smell, and low oil levels.
  • Solution: Replacement of the leaking seals and gaskets. Thorough cleaning of affected areas is also recommended.
  • Estimated Cost to Fix: $300 - $1,500+
• Turbocharger Failure
  • Description/Symptoms: Whining noises from the engine bay, loss of power, and potential check engine light illumination.
  • Solution: Diagnosis by a qualified technician to determine the cause of failure. Replacement or rebuild of the turbocharger unit.
  • Estimated Cost to Fix: $1,500 - $4,000+

Transmission

7G-TRONIC PLUS 7-Speed Automatic

• Rough Shifting
  • Description/Symptoms: Hesitation or jerking during gear changes, particularly at lower speeds. This may also be accompanied by a “clunking” noise.
  • Solution: Replacement of the conductor plate in the valve body. Service the transmission by flushing the old fluid and refilling with OEM approved fluid.
  • Estimated Cost to Fix: $700 - $2,000+
• Torque Converter Issues
  • Description/Symptoms: Shuddering or vibrations at low speeds, especially when accelerating gently. This can also manifest as a hesitation or delay in engagement.
  • Solution: Replacement of the torque converter unit.
  • Estimated Cost to Fix: $1,500 - $3,500+

Suspension

• Air Suspension Failure (Airmatic)
  • Description/Symptoms: The vehicle sits unevenly, one corner being lower than the others. The ride becomes harsh and bumpy. A warning message may appear on the dashboard indicating “Airmatic Visit Workshop.”
  • Solution: Diagnosis to identify the faulty component, which could be an air strut, air compressor, valve block, or air line. Replacement of the defective part.
  • Estimated Cost to Fix: $1,000 - $3,000+ per strut; $800 - $1,500 for compressor.

Electrical

• Battery Drain Issues
  • Description/Symptoms: The car battery drains overnight or within a few days of being parked, preventing the car from starting.
  • Solution: Diagnosing the source of the parasitic draw, which could be a faulty module, sensor, or wiring issue. Replacing or repairing the offending component.
  • Estimated Cost to Fix: $150 - $1,000+
• Infotainment System Malfunctions
  • Description/Symptoms: The COMAND system freezes, crashes, or becomes unresponsive. Bluetooth connectivity issues. Navigation problems.
  • Solution: Software updates, or replacement of the head unit.
  • Estimated Cost to Fix: $300 - $2,500+
• Sensor Failures
  • Description/Symptoms: Malfunctions with parking sensors, blind spot monitoring, or lane keep assist features. Error messages on the dashboard.
  • Solution: Diagnosis to identify the faulty sensor. Replacement of the sensor.
  • Estimated Cost to Fix: $200 - $800+ per sensor

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, unusual noises during operation, or water leaks.
  • Solution: Cleaning and lubrication of the sunroof tracks and mechanism. Replacement of damaged parts, such as the motor or cables.
  • Estimated Cost to Fix: $200 - $1,200+

Interior

• Seat Control Module Issues
  • Description/Symptoms: Malfunctions with power seat adjustments, including inability to move the seat or headrest. Memory seat functions not working correctly.
  • Solution: Replacement of the seat control module.
  • Estimated Cost to Fix: $500 - $1,500+
• Dashboard Cracking
  • Description/Symptoms: Cracking of the dashboard, particularly in areas exposed to direct sunlight.
  • Solution: Replacement of the dashboard. Aftermarket dash covers are also available.
  • Estimated Cost to Fix: $1,500 - $3,000+ for replacement

Recalls: None Found

Summary:

The 2016 Mercedes-Benz S400L offers a luxurious driving experience but is prone to certain common issues. Engine oil leaks and turbocharger problems can be costly, as can suspension issues related to the Airmatic system. Electrical glitches, particularly those affecting the infotainment system, are also reported. Transmission issues can manifest as rough shifting and may require valve body or torque converter replacements. While some repairs are relatively inexpensive, others can be significant. Overall, potential buyers should be aware of these potential problems and budget accordingly for maintenance and repairs.