Vehicles using OM656.929 engine list:

Engine OM656.929

Symptoms:
- Loss of power or reduced engine performance
- Rough idling or engine misfires
- Increased fuel consumption
- Warning lights on the dashboard, such as the check engine light
- Unusual noises from the engine bay
- Excessive smoke from the exhaust

Diagnosis:
- Use diagnostic tools to read fault codes from the engine control unit (ECU)
- Inspect the turbocharger for signs of wear or damage, as turbo issues are common
- Check the diesel particulate filter (DPF) for clogging or regeneration failures
- Examine the fuel system, including injectors and fuel filters, for blockages or leaks
- Inspect the EGR (Exhaust Gas Recirculation) valve for carbon buildup or malfunction
- Verify the condition of the timing chain and associated components for wear

Fixes:
- Clean or replace the diesel particulate filter if clogged
- Repair or replace faulty turbochargers or related components such as actuators
- Clean or replace EGR valves to restore proper function
- Replace worn or damaged fuel injectors and fuel filters
- Address timing chain wear by replacing the chain and tensioners as needed
- Perform software updates or ECU recalibration to resolve electronic control issues

Prevention:
- Adhere strictly to the manufacturer’s recommended maintenance schedule, including timely oil and filter changes
- Use high-quality diesel fuel and approved lubricants to reduce deposit formation
- Regularly drive the vehicle at higher RPMs to facilitate DPF regeneration and prevent clogging
- Avoid frequent short trips that prevent the engine from reaching optimal operating temperature
- Monitor warning lights promptly and address issues early to prevent escalation
- Keep the engine clean and inspect components periodically for early signs of wear or damage