BMW E90 335i N54 high-pressure fuel pump failure
335i
How can you tell an E90 335i high-pressure fuel pump (HPFP) fault?
The car goes into limp mode and the high fuel pressure collapses, especially under brisk acceleration. A low-pressure side sensor fault code can also be caused by the high-pressure pump, so do not replace the sensor or the feed pump first.
What should you note when replacing the high-pressure pump?
The intake manifold has to be removed. Its bolts are M7 size and the small bolt is easy to lose. Any carbon deposits under the intake manifold and in the intake ports are worth cleaning at the same time.
Is it worth buying a used high-pressure pump?
No, because the high-pressure pump has a design flaw and the same fault can come back. Check that the part fits before ordering: part number 13517616170 is reported to be correct for the N54, but number 13517610761 belongs to the N55 engine and does not fit.
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