Vehicles using M276.954 engine list:

Engine M276.954

Symptoms:
- Rough idling and loss of power
- Excessive oil consumption or oil leaks
- Check Engine Light (CEL) illumination with misfire or camshaft-related fault codes
- Unusual engine noises such as ticking or knocking
- Reduced fuel efficiency

Diagnosis:
- Inspect for oil leaks around valve covers and timing chain area, common in M276 engines
- Use a diagnostic scanner to check for fault codes related to camshaft adjusters, ignition coils, or misfires
- Perform a compression test to rule out internal engine wear or damage
- Check the condition of ignition coils and spark plugs, as misfires often stem from these components
- Inspect timing chain tensioners and guides for wear or failure, which can cause timing issues and engine noise

Fixes:
- Replace faulty ignition coils and worn spark plugs to resolve misfires and rough running
- Repair or replace leaking valve cover gaskets and seals to stop oil leaks
- Service or replace timing chain tensioners and guides if timing chain noise or timing faults are detected
- Clean or replace camshaft adjusters if they are causing timing errors or CEL codes
- Regular oil changes with manufacturer-recommended oil to maintain proper lubrication and prevent sludge buildup

Prevention:
- Adhere strictly to the recommended maintenance schedule, especially oil and filter changes, to avoid sludge and premature wear
- Use high-quality synthetic oil meeting Mercedes-Benz specifications to ensure proper engine protection
- Monitor engine performance and address any CEL warnings promptly to prevent further damage
- Avoid extended idling and aggressive driving to reduce stress on timing components and ignition system
- Periodically inspect ignition components and replace them proactively based on mileage or symptoms to maintain smooth engine operation