2024 — 2026
2.0L Turbo I4 (M254) - E300 e Plug-in Hybrid
Plug-in Hybrid
During your test drive, toggle between the petrol engine and electric-only modes multiple times. | Reason: You want to ensure the transitions are seamless and that there isn't a noticeable hesitation or 'clunk' when the M254 engine engages, which can sometimes indicate software fine-tuning needs.
Operate the MBUX infotainment screen and steering wheel haptic controls while driving on a bumpy road. | Reason: The W214 relies heavily on touch interfaces; ensure all inputs are responsive and not suffering from ghost-touches or lag, as these units can be complex to diagnose if they act up.
Find a quiet street, come to a complete stop, and listen closely for any unusual whine from the regenerative braking system. | Reason: While some electric motor whine is standard, a persistent or grinding noise could suggest the regenerative braking controller or hybrid motor assembly warrants a closer inspection by a specialist.
Check the interior ambient lighting and door panel fitment across all four doors. | Reason: Mercedes build quality is generally high, but in earlier W214 models, checking for consistent trim alignment and light bleeding helps ensure the car has been treated gently by its previous owners.
Typically the time to inspect the auxiliary hybrid cooling circuits and ensure the plug-in charging port seals are still supple and weather-tight.
Consider a full hybrid-system diagnostic check and a deep cleaning of the cabin air filtration system.
It is worth planning for a comprehensive inspection of the suspension bushings and verifying the health of the high-voltage battery state-of-health report.
Always use the specific engine oil recommended by Mercedes-Benz to protect the M254 engine's complex turbocharger and emission systems.
Keep up with the scheduled transmission fluid changes; this helps the 9G-TRONIC gearbox maintain its smoothness over the long term.
Regularly clean the charging port area to prevent debris buildup, which helps maintain a solid connection for your home or public charger.
Have the brake fluid flushed every two years to ensure the regenerative and physical braking systems work in perfect harmony.
Keep the MBUX software updated by visiting an authorized service center, as these updates often improve hybrid efficiency and system stability.
Estimated repair costs if issues arise
If your model is equipped with Airmatic, you might eventually need to budget for strut or compressor maintenance as the vehicle reaches higher kilometers.
While the battery is covered by a long warranty, it's wise to plan for potential out-of-warranty diagnostics or cooling pump maintenance in the distant future.
If the windscreen is replaced or a sensor is bumped, you may need to budget for a specialized dealership calibration to keep the safety systems fully functional.
Noticed something inaccurate or missing?Suggest an edit→
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