2009 BMW Z4 N52B30/N54B30 (E89)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Wastegate rattle on N54 engines
• Coolant expansion tank cracking
• Convertible top hydraulic leaks

First checks

• Inspect turbocharger and wastegate noise on N54
• Check for coolant leaks on expansion tank
• Test convertible top operation and seals

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

• The E89 Z4 launched in 2009 globally replacing the E85 model, with engine offerings varying by market.
• N54 engines are more common in North America and Europe for 35i trims, while N52 powered 30i trims appeared in several markets.