2012 BMW 5 Series 550i N55B30 (F10)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• High-pressure fuel pump failure (N55 engine)
• Turbocharger wastegate rattling
• Electric water pump overheating

First checks

• Inspect HPFP and turbocharger for noise
• Check oil leaks around valve cover gasket
• Verify condition of cooling system components

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

• Power output may vary slightly by market due to emissions and tuning
• The N55 replaced the previous N54 twin-turbo engine in most markets by 2012
• Available body styles predominantly sedan; touring versions exist under 550i badge but may differ by market