2018 — 2021
2.0L I4 Turbo Diesel (OM654)
Diesel
Check cold start top-end noise | Note: Listen for a persistent ticking or tapping sound from the upper engine; early OM654 units can suffer from premature rocker arm and camshaft wear.
Listen for front suspension clunks | Note: Facelift W205 models frequently experience accelerated wear in the front lower hydro-bushings, especially on abrasive NZ secondary roads.
Cycle through COMAND/MBUX infotainment | Note: Electronic glitches or sudden screen blackouts can indicate software bugs or underlying voltage drops in the auxiliary battery module.
Inspect AdBlue/SCR system readiness | Note: Ensure no emissions warning lights are present; injector crystallization or sensor failures in the SCR system are common on these models.
Engine oil service using ultra-low ash MB 229.71 spec oil; check for any active factory recalls regarding the steering column or oil lines.
Major service including 9G-Tronic transmission fluid change (pan replacement required), fuel filter renewal, and engine air filter replacement.
Thorough inspection of the turbocharger actuator linkage, cooling system hose connections, and replacement of the accessory drive belt kit.
Strict adherence to oil change intervals using only MB-approved 0W-20 low-ash synthetic oil to protect the aluminum block.
Routine cleaning of panoramic sunroof drainage tubes to prevent water tracking down into interior electronic modules.
Biannual brake fluid flush to maintain ABS/ESP system longevity and prevent electronic brake booster corrosion.
Monitor coolant levels to detect early signs of internal EGR cooler leaks which can lead to hydraulic lock over time.
Regular inspection of the DPF differential pressure sensor and exhaust temperature sensors for carbon fouling.
Estimated repair costs if issues arise
High severity; if top-end ticking is ignored, it can cause catastrophic valve train damage. Requires top-end teardown.
Essential at 60k intervals; the plastic oil pan has integrated filters and must be replaced as a complete unit.
Frequent failure points within the emissions control system; replacement parts are dealer-only items.
Essential for roadworthiness and handling precision; replacement of complete arms is recommended over pressing bushings.
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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