N54 BMW engines with the MSD80 DME software can suffer fuel injector MOSFET driver failure, leading to one of the injectors ceasing to deliver fuel, resulting in engine misfire and rough operation. This part comprises of 6 MOSFET transistors, with one for each injector to activate fuel injection. Its replacement can consequently fix the faults associated with 30BA, 30BB codes etc. Utilizing this part and a DIY video, ECU/DME repair is achievable. Diagnostic fault codes (error messages): 30BA - DME Digital Motor Electronics, Internal Failure 30BB - DME Digital Motor Electronics, Internal Failure 29D9 - Misfire with low fuel level 29CC - Misfire Multiple Cylinders 29CD - Cylinder 1 Misfire 29CE - Cylinder 2 Misfire 29CF - Cylinder 3 Misfire 29D0 - Cylinder 4 Misfire 29D1 - Cylinder 5 Misfire 29D2 - Cylinder 6 Misfire Affected N54 Powered BMW models: BMW E82 135i 2007-2013  BMW E90/E91 335i/ 335xi 2007-2008  BMW E92/E93 335i 2007-2010 BMW E60 535i/535xi 2009-2010 BMW E89 Z4 35i 2009-2016 These only in N54 and N54T 6 cylinder turbo engines and BMW Siemens DME MSD80 Please note, the MSD80 module shown in the photo for illustration purposes and is not included.