Vehicles using M112.949 engine list:

Engine M112.949

Symptoms:
- Rough idling and misfires
- Engine hesitation or lack of power
- Check Engine Light (CEL) illumination
- Oil leaks around valve covers or camshaft seals
- Increased oil consumption

Diagnosis:
- Inspect ignition coils and spark plugs for wear or damage, as these engines are prone to coil pack failures causing misfires.
- Perform a compression test to rule out internal engine wear.
- Check for vacuum leaks around intake manifold gaskets and hoses.
- Examine valve cover gaskets and camshaft seals for oil leaks.
- Scan for fault codes related to ignition, fuel injection, or camshaft position sensors.

Fixes:
- Replace faulty ignition coils and worn spark plugs to restore smooth engine operation.
- Replace valve cover gaskets and camshaft seals to stop oil leaks.
- Repair or replace intake manifold gaskets if vacuum leaks are detected.
- Clean or replace the mass airflow sensor (MAF) if engine hesitation persists.
- Use OEM or high-quality replacement parts to ensure reliability.
- Regularly change engine oil and filter to maintain proper lubrication and prevent sludge buildup.

Prevention:
- Follow the manufacturer’s recommended maintenance schedule, especially for spark plug and ignition coil replacement intervals.
- Use high-quality engine oil meeting Mercedes Benz specifications to reduce wear and deposits.
- Regularly inspect for oil leaks and address them promptly to avoid engine damage.
- Avoid prolonged idling and aggressive driving to reduce stress on ignition components.
- Keep the air intake system clean and free of debris to maintain optimal engine performance.

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