Vehicles using OM612.990 engine list:

Engine OM612.990

Symptoms:
- Rough idling and loss of power
- Excessive smoke from the exhaust (black or blue)
- Engine warning light illumination
- Difficulty starting or misfires
- Oil leaks around the valve cover or turbocharger area

Diagnosis:
- Check for clogged or dirty fuel injectors causing poor combustion
- Inspect the turbocharger for wear or shaft play leading to reduced boost
- Examine the EGR valve for carbon buildup causing rough running
- Look for oil leaks from valve cover gasket or turbo oil seals
- Perform compression test to rule out internal engine wear
- Scan for fault codes related to sensors (MAF, MAP, crankshaft position)

Fixes:
- Clean or replace fuel injectors to restore proper spray pattern
- Repair or replace the turbocharger if worn or damaged
- Clean or replace the EGR valve to prevent carbon-related issues
- Replace valve cover gasket and turbo oil seals to stop oil leaks
- Replace faulty sensors as indicated by diagnostics
- Regular oil and filter changes to maintain engine health

Prevention:
- Use high-quality diesel fuel and additives to keep injectors clean
- Follow strict oil change intervals with recommended oil grade
- Avoid extended idling to reduce carbon buildup in EGR and intake
- Regularly inspect and maintain turbocharger and associated hoses
- Address warning lights promptly to prevent further damage

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