2021 BMW 840i B58B30M0 (G16)
G16 / Coupe / Convertible / Gran Coupe / Global (varies by region: Europe, USA, Asia; engine output may differ slightly)
B58B30M0Exact year/trim recordSilver
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Minor coolant leaks from water pump in higher mileage
- Rare high pressure fuel pump issues
First checks
- Check turbocharger wastegate operation
- Inspect VANOS system for rattling/noise
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
- The 840i shares engine and drivetrain with the G20 3 Series M Sport lineup.
- Differences in power output and emissions setups depend on market and local regulations.