Vehicles using D5244T21 engine list:

Engine D5244T21

Symptoms:
- Loss of power or reduced engine performance
- Excessive smoke from the exhaust, especially black or blue smoke
- Engine warning light (check engine) illumination
- Rough idling or stalling
- Increased oil consumption or oil leaks
- Unusual engine noises such as knocking or ticking

Diagnosis:
- Use an OBD-II scanner to check for fault codes related to turbocharger, EGR system, or fuel injection
- Inspect turbocharger for signs of wear, shaft play, or oil leaks
- Check EGR valve and cooler for clogging or malfunction
- Examine fuel injectors for clogging or failure
- Perform compression test to assess engine internal condition
- Inspect for oil leaks around valve cover gasket and turbocharger seals

Fixes:
- Clean or replace clogged EGR valve and cooler to restore proper exhaust gas recirculation
- Repair or replace faulty turbocharger components; rebuild turbo if necessary
- Replace worn or leaking fuel injectors to ensure proper fuel delivery
- Fix oil leaks by replacing gaskets and seals, especially valve cover gasket and turbo seals
- Perform regular oil and filter changes using manufacturer-recommended specifications to protect engine internals
- Update engine control software if available to improve performance and emissions

Prevention:
- Adhere strictly to scheduled maintenance intervals, including oil and filter changes
- Use high-quality diesel fuel and additives if recommended to keep injectors clean
- Avoid prolonged idling and aggressive driving to reduce stress on turbocharger and EGR system
- Regularly inspect and clean air intake and intercooler systems to prevent contamination
- Monitor engine warning lights promptly and address issues early to prevent further damage

By following these diagnostic steps, fixes, and preventive measures, owners of Volvo vehicles equipped with the D5244T21 engine can maintain reliable performance and extend engine life.