1998 BMW 318i M43B18/M44B19 (E46)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Cooling system plastic components prone to failure
• Rear subframe mounting corrosion in some climates

First checks

• Confirm engine code due to market-dependent variation
• Verify timing chain condition and tensioner status

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

• Market and model variant differences significant; confirm local engine code for precise specification
• 1998 was a transitional production year from M43 to M44 engine in many regions