2003 SUBARU Impreza EJ20/EJ25 (GD)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Head gasket issues in some EJ20 engines
• Oil leaks from valve cover gaskets
• Turbocharger wear in WRX models

First checks

• Inspect timing belt and water pump history
• Check for head gasket leaks
• Verify turbocharger condition on applicable trims

Antes de cambiar piezas

• 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 and specification variations depend significantly on exact market and trim level; EJ20 more common in Japan/Europe, EJ25 in North America.
• Timing belt interval critical for long-term reliability, varies around 60,000-105,000 km depending on region.