2013 — 2016
2.0L Turbo (M274 DE20 AL) - E250 Efficiency/Avantgarde
Petrol
Listen carefully for a cold-start rattle from the engine bay. The M274 engine's timing chain tensioner and camshaft adjusters can occasionally show signs of wear, so ensure the engine is stone cold before you start it during your inspection.
Cycle through the COMAND infotainment system while driving. Check that the scroll wheel functions smoothly and the display doesn't flicker, as these modules can sometimes develop intermittent connectivity issues as they age.
During low-speed maneuvering, pay close attention to the steering feel. The electric steering rack occasionally develops a 'notch' or stiffness, so perform some full-lock turns in a quiet parking area to check for smooth operation.
Engage the transmission in 'Sport' mode and accelerate moderately. Observe if there is any hesitation or clunking during gear changes, as the 7G-Tronic transmission benefits from consistent oil service intervals to keep shifts crisp.
Usually marks the point where the transmission fluid and filter service is due if not already completed.
Consider having a specialist inspect the auxiliary drive belt, tensioners, and water pump for signs of age-related degradation.
A common point to review the suspension bushings and engine mounts, which can start to soften, affecting ride quality.
Check for a stamped service history book or digital record, prioritizing those serviced by Mercedes specialists.
Verify the coolant has been changed periodically, as the M274 engine's cooling system performs best with fresh fluid.
Inspect the tires for even wear, which will confirm the wheel alignment is set correctly and the suspension components are healthy.
Confirm that the Panoramic sunroof, if fitted, has been cleaned and lubricated to prevent sticking.
Ensure all recall campaigns, particularly those related to airbags or steering components, have been addressed by an authorized agent.
Estimated repair costs if issues arise
In cars of this age, it's common to consider the longevity of the timing chain components. If a professional technician identifies excessive chain stretch or tensioner wear, it is a significant job that involves timing cover removal and high-precision work.
To keep your gear shifts silky smooth, you might eventually need to budget for a transmission fluid and filter flush. It’s a vital maintenance step that ensures the longevity of the valve body and internal solenoids.
If you notice increased vibration while sitting at idle, it may be time to look at the engine mounts. These are hydraulic units that naturally lose their damping effectiveness over time.
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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