2014 — 2020
S 400 Hybrid 3.5L V6 - Fuel Efficient Hybrid
Petrol/Electric
When maneuvering at low speeds, listen for any clicking or clunking from the air suspension system, as these units can occasionally develop leaks or sensor issues as they approach higher kilometers.
While driving, pay close attention to the transition between electric power and the V6 petrol engine; if you feel a harsh jolt or vibration, it is worth having a specialist assess the hybrid control unit and transmission mounts.
Check the COMAND infotainment screen by cycling through all menus, ensuring the touchpad and rotary controller respond immediately, as the electronic modules in this generation are quite sophisticated and can occasionally experience glitches.
Before setting off, inspect the service history for consistent transmission fluid changes, as the 7G-TRONIC or 9G-TRONIC gearboxes perform best when this specific maintenance schedule has been meticulously followed.
Usually marks the point where the air suspension struts and compressor should be inspected for long-term health.
A common milestone where you might consider a professional health check of the high-voltage battery system to ensure optimal hybrid efficiency.
The typical interval where suspension bushings and control arms might show signs of wear, which can impact the 'magic carpet' ride quality.
Ensure the auxiliary battery is load-tested, as these are vital for the smooth operation of the S-Class electronic systems.
Verify that the hybrid cooling system has been flushed and serviced per the recommended manufacturer intervals.
Regularly treat the leather upholstery and trim to maintain that iconic Mercedes-Benz cabin feel.
Check for any signs of water ingress in the boot area, as clear drainage channels are vital for the health of the rear electronics.
Use high-quality synthetic engine oil, as the 3.5L V6 engine thrives on regular, high-spec lubrication.
Estimated repair costs if issues arise
In cars of this age, it is common to consider that these components may eventually require replacement to maintain ride comfort. Depending on the car's history, you might eventually need to budget for the replacement of one or more corners.
While these batteries are designed for longevity, if this component needs attention in the future, it is a significant but manageable investment to restore the vehicle's hybrid efficiency.
To keep the shifts smooth and the hybrid system working in harmony with the drivetrain, budgeting for a transmission service is a proactive way to avoid future mechanical headaches.
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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