2013 — 2017
3.5L V6 Hybrid (M276) - S400 Hybrid
Petrol Hybrid
Check the battery state of health by cycling through the vehicle menus on the instrument cluster. | Note: The W222 S400 Hybrid relies on a complex high-voltage system; ensuring the hybrid battery shows consistent charge levels is a sensible starting point.
Listen carefully for any suspension knocking or uneven ride height when parked on a flat surface. | Note: The Airmatic suspension is brilliant when working well, but it is worth observing how quickly the car levels itself after being parked.
Test the transition between electric-only mode and the V6 combustion engine. | Note: The switch should be seamless; any harsh shuddering or hesitation during the engine startup phase is something to investigate further with a pre-purchase inspection.
Operate every single feature of the Comand infotainment system and seat adjustments. | Note: Because these cars are loaded with electronic modules, testing that every seat massage function and screen sub-menu works ensures you won't have hidden tech surprises later.
Usually marks the time to inspect the air suspension struts for minor leaks and verify the condition of the hybrid system cooling pump.
A common point where transmission fluid servicing is recommended to maintain the longevity of the 7G-TRONIC gearbox.
Consider having a specialist inspect the engine mounts and accessory belt tensioners, as these naturally settle over time.
Prioritise a full service history specifically stamped by a Mercedes-Benz specialist or authorised dealer.
Ensure the brake fluid has been flushed within the last two years, as this is vital for the regenerative braking system efficiency.
Keep an eye on the cabin air filter condition to ensure the air filtration system continues to provide that S-Class level of comfort.
Regularly monitor the engine oil levels, as the M276 V6 engine performs best when kept at the optimal manufacturer-specified level.
Don't overlook the software updates; ask your mechanic if all control modules are running the latest firmware during your next service.
Estimated repair costs if issues arise
While they provide a world-class ride, these components are wear-and-tear items. If this component needs attention in the future, it involves replacing the air struts or the compressor unit.
This is a sophisticated part of the hybrid drivetrain. Depending on the car's history, you might eventually need to budget for a capacity test or cell balancing to ensure hybrid efficiency remains high.
To keep the gear changes silky smooth, the transmission requires specific fluid and filter changes. It is a good piece of future budget planning to have this done every 60,000km to 80,000km.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer