2021 BMW 7 Series 740i B58B30M0/B58B30M1 (G11/G12)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• High-pressure fuel pump wear under boosted conditions
• Timing chain tensioner noise under cold starts (early production units)

First checks

• Verify coolant condition and level
• Inspect turbocharger and charge pipe for leaks
• Confirm battery health for mild hybrid function

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

• Mild-hybrid system used in some markets to improve fuel economy and reduce turbo lag
• Turbocharged inline-6 superseded V8 in many markets for 2021 7 Series 740i
• Market variations exist: e.g. some regions may have different emissions controls and minor component differences