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The Mercedes-Benz S-Class W222 S 560e represents the perfect combination of luxury, performance, and eco-friendly hybrid technology. As a plug-in hybrid (PHEV), it offers improved fuel efficiency and lower emissions while delivering the premium comfort expected from an S-Class. However, like any complex luxury vehicle, the S 560e is not immune to mechanical, electrical, and hybrid-related issues.
In this comprehensive guide, we will explore the most common problems associated with the Mercedes S-Class W222 S 560e, their causes, symptoms, and potential solutions. Understanding these problems will help owners take preventive measures, ensuring a smoother and more reliable driving experience.
Mercedes S-Class W222 S 560e Hybrid System and Battery-Related Issues
The Mercedes S 560e is equipped with a sophisticated plug-in hybrid system, which combines a 3.0L V6 twin-turbocharged engine with a 13.5 kWh lithium-ion battery. While this setup enhances fuel efficiency and electric driving capabilities, it also introduces potential issues related to battery performance, charging, and hybrid system operation.
High-Voltage Battery Degradation
One of the most significant concerns with the S 560e is the gradual degradation of the high-voltage lithium-ion battery over time. Battery capacity loss reduces the electric-only range, forcing the car to rely more on the petrol engine, thereby
diminishing the efficiency benefits of a plug-in hybrid.
Common signs of battery degradation include:
Decreased electric range compared to when the car was new
Reduced power output during electric driving
Increased reliance on the internal combustion engine
To prolong battery life, it’s recommended to:
Avoid frequent deep discharges (try to keep the battery charge between 20% and 80%)
Charge the battery using Level 2 chargers rather than rapid charging, which generates more heat
Park the car in shaded or cool areas to minimize heat-related battery degradation
If the battery capacity significantly declines, replacement can be expensive. However, some specialists offer battery reconditioning services to restore partial capacity.
Charging System Malfunctions
The charging system in the S 560e allows owners to recharge the battery via a home wall charger or public charging stations. However, some owners have reported issues where the vehicle fails to charge or charges at a much slower rate than expected.
Potential causes include:
Faulty charging cables or connectors
Malfunctioning onboard charger
Software bugs affecting the charge management system
To troubleshoot charging problems, owners should first inspect the charging cable and try using different charging stations. If the issue persists, a diagnostic check at a specialized Mercedes-Benz service center is necessary.
Hybrid System Error Messages
Some S 560e owners have encountered hybrid system warning messages on the dashboard, often accompanied by reduced power output or the inability to enter electric mode.
These issues may arise due to:
Faulty power electronics module
Battery cooling system failure
Electrical sensor malfunctions
Performing a software reset or updating the hybrid system software often resolves minor glitches. However, if the issue persists, a full hybrid system diagnostic is required to pinpoint the faulty component.
Mercedes S-Class W222 S 560e Engine and Performance Issues
Despite the addition of a hybrid powertrain, the S 560e still relies on its 3.0L twin-turbocharged V6 petrol engine. While this engine is known for its smooth power delivery, it has been reported to suffer from various performance-related issues over time.
Turbocharger and Boost Pressure Issues
The twin-turbocharged V6 engine in the S 560e delivers impressive performance, but turbo-related issues can develop, leading to power loss and reduced acceleration.
Common problems include:
Wastegate actuator failure, causing erratic boost pressure
Carbon buildup affecting turbo efficiency
Oil leaks leading to premature turbo wear
A noticeable drop in power, excessive exhaust smoke, or a whining noise from the engine bay may indicate turbocharger issues. Regular oil changes using high-quality synthetic oil can help prevent premature turbo failure.
Carbon Buildup in Intake Valves
Like many direct-injection engines, the S 560e’s V6 engine is prone to carbon buildup on the intake valves. Over time, this can lead to rough idling, engine misfires, and reduced fuel efficiency.
Symptoms of excessive carbon buildup include:
Engine hesitation during acceleration
Poor throttle response
Check engine light with misfire codes
Periodic intake valve cleaning using walnut blasting or chemical treatments can help restore engine efficiency.
Mercedes S-Class W222 S 560e Transmission and Drivetrain Problems
The S 560e is equipped with a 9-speed (9G-Tronic) automatic transmission, designed to deliver smooth and efficient gear shifts. However, transmission-related issues have been reported by some owners.
Hard Shifting and Transmission Slipping
One of the most common transmission complaints is rough shifting, delayed gear engagement, or slipping under acceleration.
These symptoms are often caused by:
Low or degraded transmission fluid
Software glitches in the transmission control unit (TCU)
Mechanical wear in transmission components
Regular transmission fluid changes (every 60,000 km) and software updates can help maintain smooth gear shifts. If problems persist, a transmission adaptation reset may be required.
Electric Motor and Transmission Integration Issues
The hybrid drivetrain integrates an electric motor with the transmission, allowing for seamless transitions between electric and petrol modes.
However, some S 560e owners have reported:
Jerky transitions between petrol and electric power
Unintended engine start-stop behavior
Inconsistent regenerative braking performance
Many of these issues are related to software calibration. Updating the hybrid drivetrain control module often resolves these problems. If not, a detailed diagnostic test is necessary.
Mercedes S-Class W222 S 560e Suspension and Ride Quality Problems
The W222 S-Class is known for its exceptional ride comfort, largely due to its AIRMATIC air suspension system. However, long-term owners have reported various suspension-related failures.
AIRMATIC Suspension Leaks and Failures
The AIRMATIC system provides adjustable ride height and damping, but it is prone to failures that can lead to:
Vehicle sagging on one side
Loud compressor noise when adjusting ride height
Harsh ride quality due to failed air struts
The most common causes of AIRMATIC suspension failure include air leaks in the struts, compressor failure, or faulty ride height sensors. If a leak is detected, it’s crucial to replace the affected component to prevent further damage to the system.
Control Arm and Bushing Wear
The S 560e’s heavy weight can accelerate wear on control arm bushings, leading to:
Clunking noises over bumps
Poor steering responsiveness
Increased road vibrations
Replacing worn bushings and control arms improves ride quality and handling.
Mercedes S-Class W222 S 560e Electrical and Infotainment System Problems
As a luxury vehicle packed with advanced electronics, the S 560e is susceptible to various electrical and infotainment-related malfunctions.
COMAND Infotainment System Glitches
Owners have reported issues with the COMAND system, including:
Freezing or slow touchscreen response
Bluetooth connectivity failures
Navigation system malfunctions
Performing a system reboot or software update often resolves these issues. In more severe cases, the infotainment control module may need to be replaced.
Battery Drain Issues
Due to its numerous electronic features, the S 560e is prone to battery drain problems, particularly if parked for extended periods.
Common causes include:
Faulty alternator or auxiliary battery
Parasitic draw from electronic modules
Excessive use of interior features when the car is off
Regular battery health checks and keeping the vehicle on a trickle charger if unused for long periods can prevent these issues.
Mercedes S-Class W222 S 560e Cooling System and Overheating Issues
The cooling system in the Mercedes S 560e plays a crucial role in maintaining optimal engine and hybrid system temperatures. However, several components within this system are prone to failure, leading to overheating and potential engine damage.
Radiator and Coolant Hose Leaks
Many S 560e owners have reported coolant leaks caused by deteriorating hoses or cracks in the radiator. Over time, exposure to heat and pressure can cause these components to weaken, resulting in coolant loss and inefficient cooling.
Common symptoms of a coolant leak include:
Low coolant warning light on the dashboard
Puddles of coolant under the vehicle
Rising engine temperatures
To prevent cooling system failures, regular inspections of coolant hoses, the radiator, and the coolant reservoir are recommended. Replacing aging components before they fail can prevent costly engine repairs.
Water Pump and Thermostat Failures
The water pump and thermostat regulate coolant circulation and engine temperature. If either component fails, the vehicle may experience overheating or fluctuating temperatures.
Symptoms of a faulty water pump or thermostat include:
Engine overheating warnings
Poor heater performance
Irregular engine temperature readings
Replacing these components at the first sign of trouble can prevent severe engine damage and extend the lifespan of the cooling system.
Mercedes S-Class W222 S 560e Braking System Issues
The braking system in the S 560e is designed to integrate traditional hydraulic braking with regenerative braking from the hybrid system. While this setup enhances efficiency, it can also introduce unique braking issues.
Regenerative Braking Inconsistencies
Regenerative braking allows the electric motor to recover energy while slowing the vehicle.
However, some owners have reported erratic braking performance, including:
Inconsistent brake pedal feel
Delayed or overly aggressive braking response
Sudden transitions between regenerative and mechanical braking
These issues can often be traced to faulty brake-by-wire sensors or software calibration problems. Updating the vehicle’s braking system software may improve performance.
Premature Brake Wear
Despite the presence of regenerative braking, some S 560e models experience premature wear on brake pads and rotors. This can be attributed to the vehicle’s weight and the occasional failure of regenerative braking to engage properly, placing extra stress on traditional braking components.
Signs of excessive brake wear include:
Squeaking or grinding noises
Longer stopping distances
Pulsations in the brake pedal
Regular brake inspections and using high-quality brake components can help extend the lifespan of the braking system.
Mercedes S-Class W222 S 560e Exhaust System and Emission Issues
Even though the S 560e is a hybrid, it still relies on a petrol engine, which means it has an exhaust system that can develop issues over time.
Catalytic Converter Failure
The catalytic converter is responsible for reducing harmful emissions. However, it can become clogged or damaged, especially if the engine runs rich or has frequent misfires.
Symptoms of catalytic converter failure include:
Reduced engine power
Rotten egg smell from the exhaust
Check engine light with emission-related error codes
If the catalytic converter fails, replacing it with a high-quality unit is necessary to maintain emissions compliance.
Oxygen Sensor Malfunctions
Faulty oxygen sensors can cause improper air-fuel mixture readings, leading to reduced fuel efficiency and increased emissions. If the check engine light appears with codes related to oxygen sensors, replacing them promptly can restore proper engine performance.
Mercedes S-Class W222 S 560e Long-Term Maintenance and Ownership Considerations
Owning a hybrid luxury vehicle like the S 560e requires regular maintenance to prevent expensive repairs. Many of the issues discussed in this guide can be mitigated with proactive servicing.
Importance of Regular Servicing
Routine maintenance such as oil changes, transmission fluid replacement, brake system checks, and hybrid system diagnostics are essential for keeping the S 560e in optimal condition. Using manufacturer-recommended fluids and parts can prevent premature wear and failures.
Software Updates and Recalls
Mercedes-Benz frequently releases software updates to improve hybrid system performance, transmission behavior, and infotainment functionality. Keeping the vehicle updated with the latest software can prevent many electronic glitches. Checking for recalls and service bulletins can also help owners identify potential factory defects before they cause major problems.
Mercedes S-Class W222 S 560e Conclusion
The Mercedes-Benz S-Class W222 S 560e is an impressive luxury plug-in hybrid, offering a refined driving experience with advanced technology. However, as with any complex vehicle, it is not without its challenges.
Common issues such as battery degradation, charging malfunctions, turbocharger failures, transmission glitches, and suspension problems can affect reliability if not addressed in time.
To ensure the longevity of your S 560e, proactive maintenance, regular servicing, and software updates are essential. By staying informed about potential problems and taking preventive measures, owners can enjoy a trouble-free experience with this sophisticated hybrid sedan.
For professional Mercedes-Benz servicing and repairs, visit European Auto Pro 253 Goodwood Road, Kings Park, 5034 South Australia.
Our expert technicians specialize in diagnosing and resolving issues specific to the S 560e, ensuring that your vehicle remains in peak condition for years to come.