The Mercedes-Benz S-Class W222 S 560 is a flagship luxury sedan that combines cutting-edge technology, superior comfort, and powerful performance. Equipped with a 4.0L twin-turbocharged V8 engine, it delivers impressive power while maintaining a refined driving experience. However, like any high-end vehicle, the S 560 is not without its flaws. Owners have reported various mechanical, electrical, and reliability issues that can impact the vehicle’s performance and longevity.
This comprehensive guide explores the most common problems associated with the Mercedes S 560, detailing their causes, symptoms, and potential solutions. Whether you own one or are considering buying a used model, this article will help you understand the potential pitfalls and how to maintain your vehicle effectively.
Mercedes S-Class W222 S 560 Engine and Performance Issues
The S 560’s 4.0L twin-turbo V8 engine is known for its power and efficiency, but it is not immune to common engine-related issues that can develop over time.
Turbocharger Problems
The twin-turbocharged engine in the S 560 enhances performance and fuel efficiency, but turbo-related issues have been reported by some owners. Common problems include:
Turbo lag and reduced power output – A failing turbocharger can cause a noticeable drop in performance, particularly during acceleration.
Excessive smoke from the exhaust – Blue or black smoke may indicate oil leakage into the turbo or incomplete fuel combustion.
Whining or grinding noises – Worn-out turbo bearings can produce high-pitched noises, signaling impending failure.
Regular oil changes using high-quality synthetic oil can help prevent premature turbocharger wear. If you experience performance issues, a professional inspection of the turbo system is recommended.
Timing Chain Tensioner and Guide Wear
The S 560 uses a timing chain system rather than a timing belt, which is generally more durable. However, some owners have reported premature wear of the timing chain tensioner and guides. A worn tensioner can cause:
Rattling noises from the engine – Most noticeable at startup.
Check engine light activation – Due to timing inconsistencies.
Loss of power and rough idling – If the timing chain stretches beyond acceptable limits.
Ignoring this issue can lead to severe engine damage. Replacing the timing chain components early can prevent costly engine repairs.
Carbon Buildup on Intake Valves
Due to direct fuel injection, carbon deposits can accumulate on the intake valves, restricting airflow and causing performance problems such as:
Rough idling and hesitation during acceleration.
Reduced fuel efficiency and increased emissions.
Engine misfires, especially at low RPMs.
Regular intake valve cleaning (walnut blasting) and using high-quality fuel with cleaning additives can help minimize carbon buildup.
Excessive Oil Consumption
Some S 560 owners have reported excessive oil consumption, requiring frequent top-ups between service intervals. This can be caused by:
Worn piston rings or valve seals – Allowing oil to enter the combustion chamber.
Turbocharger leaks – Causing oil loss through the intercooler system.
PCV system malfunctions – Resulting in improper oil ventilation.
Checking oil levels regularly and addressing leaks early can prevent engine damage.
Mercedes S-Class W222 S 560 Transmission and Drivetrain Problems
The Mercedes S 560 comes with a 9-speed automatic transmission (9G-Tronic), designed for smooth shifting and fuel efficiency. However, various transmission-related problems can arise over time.
Harsh Shifting and Hesitation
Many owners have experienced harsh shifting, particularly during acceleration or deceleration. This can be caused by:
Low or degraded transmission fluid – Affecting hydraulic pressure and gear changes.
Software-related glitches – Causing delayed or abrupt shifting.
Worn clutch packs or valve body issues – Leading to inconsistent gear engagement.
Mercedes recommends changing the transmission fluid every 60,000 km to prevent these issues. If shifting problems persist, a transmission software update or adaptation reset may be necessary.
Transmission Slipping
Transmission slipping occurs when the gearbox fails to hold a gear properly, leading to erratic RPM changes and loss of acceleration. This issue is often linked to:
Worn-out transmission components – Such as clutch packs or solenoids.
Contaminated transmission fluid – Reducing lubrication and causing overheating.
Electronic control unit (TCU) failures – Resulting in improper gear selection.
Prompt diagnosis and servicing can prevent further damage to the transmission system.
Mercedes S-Class W222 S 560 Suspension and Ride Quality Issues
The Mercedes S 560 is equipped with the AIRMATIC air suspension system, which provides an exceptionally smooth ride. However, this advanced system is prone to failures that can lead to ride discomfort and costly repairs.
AIRMATIC Air Suspension Failures
Common problems with the AIRMATIC suspension include:
Leaking air struts – Causing one side of the vehicle to sit lower than the other.
Faulty air compressor – Resulting in slow or failed suspension adjustment.
Malfunctioning ride height sensors – Leading to incorrect suspension settings.
Symptoms of AIRMATIC failure include a rough ride, increased body roll, and noticeable sagging when the car is parked overnight. Replacing worn air struts or compressors early can prevent complete system failure.
Control Arm and Ball Joint Wear
Control arms and ball joints are crucial for maintaining proper alignment and stability. Over time, these components can wear out, leading to:
Clunking noises when going over bumps.
Uneven tire wear due to misalignment.
Loose or unstable steering response.
Replacing worn control arms and ball joints restores ride quality and handling precision.
Mercedes S-Class W222 S 560 Electrical and Infotainment System Issues
As a technology-packed luxury vehicle, the S 560 features numerous electronic components that enhance the driving experience. However, these systems can also be a source of frustration when they malfunction.
COMAND System Failures
The COMAND infotainment system controls navigation, entertainment, and vehicle settings. Common issues include:
System freezing or crashing – Due to software glitches or hardware malfunctions.
Touchscreen and control knob unresponsiveness.
Navigation and Bluetooth connectivity problems.
Updating the software or performing a hard reset can often resolve these issues. If the problems persist, a module replacement may be required.
Battery Drain and Charging System Malfunctions
Battery drain is a common issue in the S 560, especially when electronic features such as ambient lighting, power seats, and infotainment screens are frequently used. Causes include:
Faulty alternator or voltage regulator.
Parasitic drain from malfunctioning electronic modules.
Aging or weak main and auxiliary batteries.
Regular battery testing and replacing faulty components can prevent unexpected breakdowns.
Adaptive Cruise Control and Driver Assist System Errors
The S 560 is equipped with advanced driver assistance systems, including adaptive cruise control, lane-keeping assist, and active brake assist. However, these systems may experience:
False alerts or failure to detect obstacles.
Sensor and camera malfunctions due to dirt, ice, or misalignment.
Software glitches requiring recalibration.
Keeping sensors clean and ensuring software updates are applied can help maintain system accuracy.
Mercedes S-Class W222 S 560 Cooling System and Overheating Issues
A well-maintained cooling system is crucial to keeping the S 560’s powerful twin-turbo V8 engine running efficiently. However, several common issues can lead to overheating, coolant leaks, and potential engine damage.
Radiator and Coolant Hose Leaks
Coolant leaks are a frequent problem in the S 560, often originating from aging radiator components or weakened coolant hoses. Symptoms of a coolant leak include:
Low coolant levels and frequent top-ups.
Visible coolant puddles under the car.
Overheating warnings on the dashboard.
Rubber coolant hoses tend to degrade over time due to heat and pressure, causing cracks and leaks. Regular inspection and timely replacement of hoses and radiator components can prevent serious overheating issues.
Water Pump and Thermostat Failures
The water pump and thermostat play a vital role in regulating engine temperature. A failing water pump can result in insufficient coolant circulation, while a faulty thermostat can become stuck in an open or closed position, leading to cooling inefficiencies. Symptoms of these failures include:
Inconsistent temperature readings.
Reduced heater performance.
Overheating after short drives.
Replacing the water pump and thermostat at the first sign of trouble helps prevent catastrophic engine damage.
Mercedes S-Class W222 S 560 Braking System Problems
The braking system of the S 560 is designed for high-performance stopping power, but it is not immune to wear and malfunctions.
Premature Brake Wear
Due to the weight of the S-Class and the high-performance braking system, the brake pads and rotors tend to wear out faster than expected. Owners have reported:
Squealing or grinding noises when braking.
Increased stopping distances.
Brake pedal vibration.
Using high-quality brake pads and rotors, and ensuring regular brake fluid changes, can improve braking longevity and performance.
Brake System Warning Lights
Some S 560 models experience intermittent brake warning lights on the dashboard. This can be due to:
Faulty brake pad wear sensors.
Malfunctions in the electronic parking brake system.
Issues with the brake booster or master cylinder.
Diagnosing these warning messages early prevents potential safety risks.
Mercedes S-Class W222 S 560 Interior and Comfort Issues
The S 560 boasts a luxurious interior, but some components show signs of premature wear and electronic failures.
Leather and Seat Bolster Wear
Over time, the leather upholstery on the seats, particularly the driver’s side, can wear out. Common problems include:
Cracking, wrinkling, and fading of leather surfaces.
Seat bolster damage from frequent entry and exit.
Regular conditioning of leather surfaces and the use of protective seat covers can help maintain the premium look of the interior.
Climate Control System Malfunctions
The advanced climate control system in the S 560 sometimes experiences issues such as:
Weak airflow or uneven cooling.
Failure of seat ventilation and heating functions.
AC compressor or refrigerant leaks.
If the AC system is underperforming, a full diagnostic check should be conducted to detect refrigerant leaks or faulty sensors.
Mercedes S-Class W222 S 560 Fuel System and Injector Problems
The S 560’s direct injection system improves efficiency and power delivery, but it can develop fuel system-related problems over time.
High-Pressure Fuel Pump Failure
A failing high-pressure fuel pump (HPFP) can cause:
Hard starts and hesitation during acceleration.
Rough idling and engine misfires.
Check engine light due to fuel delivery inconsistencies.
Replacing the HPFP when symptoms arise prevents further damage to the fuel system.
Carbon Buildup in Injectors
Direct injection engines are prone to carbon buildup on fuel injectors, leading to:
Reduced performance and fuel efficiency.
Engine hesitation and misfires.
Increased emissions.
Periodic fuel injector cleaning and using high-quality fuel additives can help reduce carbon buildup.
Mercedes S-Class W222 S 560 Exhaust System and Emission Control Issues
The exhaust system in the S 560 includes components such as catalytic converters, oxygen sensors, and particulate filters that can develop problems.
Catalytic Converter Failure
A clogged or failing catalytic converter can lead to:
Reduced acceleration and power loss.
Illuminated check engine light.
Unusual exhaust smells, such as sulfur or rotten eggs.
Regular maintenance and addressing engine misfires early can help prolong the lifespan of the catalytic converter.
Oxygen Sensor Malfunctions
Faulty oxygen sensors can cause:
Poor fuel economy.
Irregular engine performance.
Higher emissions.
Replacing malfunctioning oxygen sensors improves fuel efficiency and engine response.
Mercedes S-Class W222 S 560 Long-Term Maintenance and Reliability Considerations
Owning a luxury vehicle like the Mercedes S 560 requires proper maintenance and proactive repairs to ensure longevity.
Regular Servicing and Preventative Maintenance
Following a strict maintenance schedule can prevent many common issues. Regular oil changes, fluid checks, and tire rotations help maintain the car’s performance and reliability.
Software Updates and Recall Checks
Mercedes-Benz frequently releases software updates for electronic modules, including the transmission, infotainment system, and driver-assist features. Ensuring your vehicle receives these updates can resolve many minor issues. Checking for recalls and service bulletins can help owners stay ahead of potential factory defects.
Conclusion
The Mercedes-Benz S-Class W222 S 560 is a masterpiece of luxury and performance, but it comes with its share of potential issues. Common problems include turbocharger failures, transmission shifting issues, air suspension leaks, electrical system malfunctions, and cooling system faults.
Proactive maintenance and timely repairs are key to ensuring the S 560 remains in peak condition. By addressing common problems early, owners can enjoy a trouble-free experience with this exceptional vehicle.
For professional Mercedes-Benz servicing and repairs, visit European Auto Pro 253 Goodwood Road, Kings Park, 5034 South Australia. Our experienced technicians specialize in diagnosing and resolving issues specific to the S 560, ensuring optimal performance and longevity.