2008 VOLVO XC90 B5254T4/B6294T (P28)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing belt wear leading to tensioner failure if intervals not maintained
• Electronic module corrosion in humid climates
• Turbocharger issues on high mileage diesel engines

First checks

• Verify timing belt condition and replacement history
• Check for coolant leaks around water pump and thermostat
• Inspect turbocharger operation and smoke on diesel variants

Before replacing parts

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• Engine availability varies significantly by market and model year within 2008.
• Global markets included Europe, USA, Canada, Australia, and others with varying emissions and trim levels.