N54 - 2010 335i fuel pressure issues - limp mode

[dmarchuk97]

I have a 2010 BMW 335i N54 and I have a problem where the vehicle goes under load. It throws the code 29f2.

I have ran the fuel logs for the LPFP and the numbers are all over the place. Link: http://youtu.be/azoeEG5LGkA
It jumps sporadically from 3900hpa to 7900hpa

The low pressure fuel is all over the place. I replaced the LPFP with an ebay one and the sporadic fuel pressure stayed the same.

Could the problem be a high pressure fuel pump or could it be a chinese low pressure fuel pump?


Thanks




LPFP - low pressure fuel pump

[jclausen]

I believe the low pressure pump has a fuel pump module too, don’t use crappy parts

[JDStrickland]

The HPFP is a known problem spot for the N54. There was a class action law suit about it.