FIXED: Return of the P0171 and P0174

[diddy0071]

It is me again! So driving my beautiful X5 home last night, and the dreaded P0171 and P0174 popped back up, along with the same symptoms as last time. Loss of power, driving slow, the works.

I replaced the fuel rail, and fuel filter along with the fuel pump last time. I ordered a replacement fuel rail because I had broken the schraeder valve on the old one, from someone on ebay, so the part was used, I figured it wouldn't cause any problems. As for the fuel filter, a brand new MANN was put in. The fuel pump however was used from a dismantler. Now, I'm not saying the fuel pump was the best condition, but being as it was the issue last time, I am thinking the thing took a shit again. Before doing any of that though, I am going to review both the MAF sensor and the DISA valve (because let's face it, I need to diagnose this thing properly with the same diagnostics as last time), and the DISA was used, so I hope it isn't that. But, overall, a little bummed as my car usually doesn't have any problems.

Problem has been fixed:

Apparently, the vehicle had a kink/damaged fuel line from the fuel rail to the filter. The fuel line leak was causing the intermittent pressure issues, and the kink was causing the poor acceleration. the kink is fixed, but the line is damaged and needs replacing. Unfortunately, it is a special order part which takes anywhere between 1 week to a month to arrive through dealerships. I have since found the part needed (13537548988 on REALOEM) online at bmwminifactorydirect.com, but am waiting for them to ship it (Maybe it will take a while with them too) I spoke to the mechanic and asked if it was at risk of damage if running as is. He said there is no real threat as long as I don't drive heavily nor far. He recommended I stick to my 3 mile commute only until the part arrives for replacement. So for now, the vehicle is back 90%, just needs the hose, but runs great and has no other problems. Just wanted to give closure to some of you.