Vehicles using M276.957 engine list:

Engine M276.957

Symptoms:
- Rough idling and misfires
- Loss of power or hesitation during acceleration
- Excessive oil consumption or oil leaks
- Check Engine Light (CEL) illumination with related fault codes
- Unusual engine noises such as ticking or knocking

Diagnosis:
- Inspect ignition coils and spark plugs for wear or failure, common causes of misfires
- Check for oil leaks around valve covers and oil cooler seals, frequent leak points on M276 engines
- Perform a compression test to assess cylinder health
- Scan for fault codes related to camshaft timing, misfires, or fuel system issues
- Examine intake manifold and PCV system for clogging or leaks affecting air-fuel mixture

Fixes:
- Replace faulty ignition coils and worn spark plugs to restore smooth combustion
- Repair or replace leaking valve cover gaskets and oil cooler seals to prevent oil loss and contamination
- Clean or replace clogged PCV valves and intake components to ensure proper ventilation and mixture
- Update engine control software if manufacturer recalls or technical service bulletins address known issues
- Address timing chain tensioner or variable valve timing actuator faults if diagnosed, as these can cause performance issues

Prevention:
- Follow recommended maintenance intervals for oil and filter changes using manufacturer-approved lubricants to reduce sludge and wear
- Regularly inspect ignition components and replace spark plugs as per schedule to avoid misfires
- Monitor oil levels frequently to detect leaks early
- Use quality fuel and avoid extended idling to minimize carbon buildup
- Keep the PCV system clean and functional to maintain proper crankcase ventilation and engine efficiency

By adhering to these diagnostic steps and maintenance practices, owners of Mercedes Benz vehicles equipped with the M276.957 engine can mitigate common issues and maintain reliable engine performance.