Vehicles using B5252S engine list:

Engine B5252S

Symptoms:
- Rough idling and hesitation during acceleration
- Loss of power and reduced fuel efficiency
- Engine misfires or stalling
- Oil leaks around the valve cover gasket area
- Check engine light illumination

Diagnosis:
- Inspect ignition components such as spark plugs, ignition coils, and wires for wear or damage
- Check for vacuum leaks around intake manifold and hoses
- Perform a compression test to assess cylinder health
- Examine timing belt condition and tension, as failure can cause severe engine damage
- Scan for fault codes to identify sensor malfunctions (e.g., oxygen sensor, MAF sensor)
- Inspect valve cover gasket for leaks and replace if necessary

Fixes:
- Replace worn or fouled spark plugs and faulty ignition coils
- Repair or replace cracked or leaking vacuum hoses
- Replace timing belt and associated components (tensioner, pulleys) at recommended intervals (typically every 100,000 km or 60,000 miles)
- Replace valve cover gasket to stop oil leaks
- Clean or replace malfunctioning sensors to restore proper engine management
- Regular oil changes using manufacturer-recommended grade to maintain engine health

Prevention:
- Adhere strictly to scheduled maintenance, especially timing belt replacement to avoid catastrophic failure
- Use quality fuel and maintain the fuel system to prevent deposits and misfires
- Regularly inspect and replace ignition components as needed
- Monitor for early signs of oil leaks and address promptly to prevent engine damage
- Keep the engine bay clean to spot leaks and wear early
- Follow Volvo’s service intervals for fluid changes and inspections to ensure longevity and reliability