Vehicles using M112.954 engine list:

Engine M112.954

Symptoms:
- Rough idling and misfires
- Loss of power and poor acceleration
- Engine warning light illumination
- Oil leaks around valve covers and timing chain area
- Unusual engine noises, such as rattling or ticking

Diagnosis:
- Check for fault codes using an OBD-II scanner to identify misfire cylinders or sensor failures
- Inspect ignition coils and spark plugs for wear or damage, as these are common failure points
- Examine valve cover gaskets and timing chain cover for oil leaks
- Perform a compression test to assess cylinder health
- Listen for timing chain noise indicating wear or tensioner failure

Fixes:
- Replace worn or faulty ignition coils and spark plugs to resolve misfires and rough running
- Change valve cover gaskets and timing chain cover seals to stop oil leaks
- Replace timing chain tensioners and guides if noise or timing issues are detected
- Clean or replace the mass airflow sensor and throttle body if performance issues persist
- Regular oil and filter changes using manufacturer-recommended grades to maintain engine health

Prevention:
- Adhere to scheduled maintenance intervals, especially ignition system and oil changes
- Use high-quality spark plugs and genuine Mercedes-Benz parts for replacements
- Monitor oil levels regularly to prevent low oil conditions that can damage timing chain components
- Address engine warning lights promptly to avoid escalation of issues
- Keep the engine bay clean to prevent dirt and debris from compromising seals and sensors

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