1998 SUBARU Impreza EJ18/EJ20 (GC)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Head gasket leaks in later high-mileage engines
• Timing belt replacement critical
• Rust susceptibility in certain regions

First checks

• Check timing belt age and condition
• Inspect head gasket area for leaks
• Verify AWD system operation

Avant de remplacer des pièces

• 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 power vary significantly by market; North America mostly EJ22 non-turbo, Europe/Japan EJ18 or EJ20.
• Turbocharged WRX models used EJ20G or EJ20K codes; 1998 standard Impreza trims typically naturally aspirated.