Vehicles using M 660.950 engine list:

Engine M 660.950

Symptoms:
- Reduced engine power and sluggish acceleration
- Excessive smoke from the exhaust, particularly black or white smoke
- Engine warning light (MIL) illuminated on the dashboard
- Rough idling or stalling, especially when cold
- Increased fuel consumption
- Difficulty starting the engine or misfires

Diagnosis:
- Check for fault codes using an OBD-II scanner to identify sensor or injector issues
- Inspect the turbocharger for signs of wear or damage, as turbo failure is common
- Examine the diesel particulate filter (DPF) status, especially on models equipped with DPF
- Test the glow plugs and glow plug relay for proper operation
- Inspect the fuel injectors for clogging or leaks
- Check for vacuum leaks or intake manifold issues that can affect air supply
- Verify the condition of the EGR (Exhaust Gas Recirculation) valve, which can become clogged

Fixes:
- Replace faulty sensors such as the MAF (Mass Air Flow) or MAP (Manifold Absolute Pressure) sensor
- Clean or replace the DPF if it is clogged; perform a forced regeneration if possible
- Repair or replace the turbocharger if damaged or worn
- Replace faulty glow plugs to improve cold starts
- Clean or replace fuel injectors to restore proper fuel delivery
- Repair vacuum leaks and clean the intake manifold and EGR valve to ensure proper airflow
- Update engine control software if recommended by the manufacturer

Prevention:
- Use high-quality diesel fuel and perform regular fuel filter changes to prevent injector clogging
- Follow the manufacturer’s recommended oil change intervals using the correct oil grade
- Avoid frequent short trips to allow the DPF to regenerate properly
- Regularly inspect and maintain the turbocharger and intake system
- Periodically check and clean the EGR valve to prevent carbon buildup
- Address engine warning lights promptly to avoid further damage

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