2005 — 2011
2.0L OM640 I4 Turbo - B 180 CDI
Diesel
While idling in Park, listen for any rhythmic clicking or metallic rattling sounds from the engine bay, as the OM640 diesel engine can experience issues with the timing chain tensioner as it ages.
Check this by performing a full lock-to-lock turn at low speeds in a parking lot to listen for any groaning or knocking from the steering rack and CV joints, which can be sensitive on the W245 chassis.
While driving, pay close attention to the gear changes; if you notice any hesitation or 'shuddering' during acceleration, this may indicate that the CVT transmission is starting to show its age.
Check this by operating the panoramic sunroof or standard electric sunroof repeatedly; these are complex systems and seals can dry out over time, leading to potential cabin leaks if not maintained.
Usually the time to evaluate the condition of the turbocharger and surrounding vacuum lines.
Consider having a specialist inspect the diesel particulate filter (DPF) and the health of the EGR system to ensure emissions efficiency.
A common point where suspension components like bushings and shock absorbers may require replacement to maintain the Mercedes ride quality.
Ensure the transmission fluid has been flushed or changed according to the schedule, as the CVT is quite sensitive to oil quality.
Verify that the cooling system has had a flush, as these engines prefer clean coolant to prevent overheating issues.
Inspect the serpentine belt and pulleys for signs of cracking or squealing during cold starts.
Check for any signs of oil weeping around the valve cover gasket or injectors, which is common in older diesel units.
Keep up with regular fuel filter changes to protect the delicate high-pressure common rail injection system.
Estimated repair costs if issues arise
If the transmission requires internal attention, it can be a significant job. It is wise to consider setting aside a contingency fund should the gearbox behave erratically.
Given the age of these vehicles, the turbocharger has likely seen many heat cycles. Depending on the car's history, you might eventually need to budget for a turbo unit replacement or refurbishment.
New Zealand roads can be tough on suspension. If you notice a clunking noise over bumps, it's common to consider replacing worn control arm bushings and struts to restore handling.
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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