N55 Engine: Erroneous Service Engine Soon Lamp Illuminated with Mixture Faults Stored in the DME. INFORMATION An error has been identified in the current version of ETK regarding N55 fuel injector replacement part numbers and production dates. Installing the incorrect injector part number can lead to an erroneous Service Engine Soon lamp illumination and various mixture faults stored in the DME. Correct part numbers and applicable production dates: P/N 13 64 7 639 994 is for all vehicles produced from 7/2013 P/N 13 64 7 597 870 is for all vehicles produced up to 7/2013
