Vehicles using M272.911 engine list:

Engine M272.911

Symptoms:
- Rough idling and misfires
- Loss of power or hesitation during acceleration
- Engine warning light (Check Engine Light) illumination
- Oil leaks around the valve cover and camshaft area
- Excessive oil consumption
- Timing chain noise or rattling at startup

Diagnosis:
- Inspect for fault codes related to misfires, camshaft position sensors, or variable valve timing (VVT) errors using an OBD-II scanner.
- Check for oil leaks around the valve cover gasket and camshaft adjuster seals.
- Perform a compression test to rule out internal engine damage.
- Listen for unusual timing chain noise indicating wear or tensioner failure.
- Inspect the camshaft adjuster and VVT system for proper operation.
- Verify the condition of ignition coils and spark plugs.

Fixes:
- Replace faulty ignition coils and worn spark plugs to resolve misfires.
- Change valve cover gasket and camshaft adjuster seals to stop oil leaks.
- Replace the timing chain tensioner and guides if noise or slack is detected.
- Clean or replace the camshaft adjuster solenoid to restore VVT function.
- Perform an oil and filter change using manufacturer-recommended oil to maintain proper lubrication.
- In severe cases, repair or replace damaged camshafts or timing components.

Prevention:
- Regularly change engine oil and filter every 10,000 km (6,000 miles) or as recommended to prevent sludge buildup and ensure proper VVT operation.
- Use high-quality synthetic oil meeting Mercedes-Benz specifications.
- Inspect and replace spark plugs and ignition coils at recommended intervals to avoid misfires.
- Monitor for early signs of oil leaks and address them promptly.
- Avoid extended idling and aggressive driving to reduce stress on timing components.
- Schedule routine maintenance and diagnostic checks to catch issues early.

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