BMW models with Turbocharged N54 engines and MSD80 DME Software can develop fuel injector MOSFET driver failure. This will cause an injector to stop delivering fuel and an engine misfire to occur. The check engine light will be ON with the related Fault Codes (error messages):
- 30BA DME digital motor electronics, internal failure
- 30BB DME digital motor electronics, internal failure
This article and video shows you how to diagnose these fault codes and test the signal from the DME to the fuel injectors. You will also see how to isolate and test each wire for the fuel injectors and test the DME MOSFET Drivers.