2008 BMW 335i N54B30 (E90/E91/E92/E93)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• High-pressure fuel pump failure
• Wastegate rattle/noise
• Carbon buildup on intake valves

First checks

• Inspect HPFP functionality
• Check turbocharger wastegate operation
• Fuel injector seals

Vor dem Teiletausch

• 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

• N54 engine was the main powertrain for 2008 335i globally, except for US and some markets where the N54 was also used.
• Some markets had minor tuning differences; US 335i models first introduced in 2007 for the 2007.5 model year.