Quote:
Originally Posted by saeyedoc
Update from SA early last night. Told me original codes related to HPFP, codes after software update indicated problem with injectors or wastegates. Regional engineer from BMW is supposed to be here today, my SA is still pushing them to replace the HPFP based on original errors, may need injectors replaced also.
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The matters discussed in this thread seem to indicate that the fuel delivery system used in the N54 and likely N55 engines has design flaws that cause cumulative deterioration of the system's components. The failure of the high pressure pump is the problem that has the greatest impact on the car's performance, but a number of the car owners whose HPFP has been replaced reported that some of their injectors triggered error codes shortly before or after the new or remanufactured pump has been installed. In other words, it is not unusual to experience injector and high pressure pump problems at nearly the same time.