1999 HYUNDAI Sonata G4JP/G4GC (EF)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing belt replacement interval critical
• Cooling system maintenance required to avoid overheating

First checks

• Check timing belt condition
• Inspect coolant system for leaks

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 specs vary by market; mainly EF chassis worldwide in 1999.
• 2.5L V6 (G6AV) mostly USA & Korea; 2.0L and 2.4L 4-cyl across wider markets.