[soulcrusher]

Hello. I replaced my crankshaft position sensor due to a 2A94 code (Crankshaft sensor, signal missing) and 3100 error code (Boost pressure control shutdown).

I started the vehicle and the car went into limp mode as shown in timeline below, after 36 seconds. A 29F2 code (high pressure fuel system, fuel pressure) appeared.

seconds
0:00 start up
0:23 RPM is unsteady for a second
0:32 RPM is recurrently unsteady
0:36 Limp mode, reduce power.

Q's
(1)May I have accidentally pulled/disconnected an electrical connector, or can a inappropriately installed the crankshaft position sensor cause this? I didn't remove the manifold or throttle body. I replaced the crankshaft sensor using an extension. New O-ring and bolt used. I haven't been able to run the car long enough to check for leaks at the new sensor.

(2)Or, did my HPFP or LPFP really decide to stop working? How do I confirm and narrow down my diagnosis? I only have a 29F2 code, read using INPA.

Help is appreciated!

[soulcrusher]

I found a great fuel system series from vehicular DIY! I recommend to owners who have fuel system concerns.

Video 1 is about ordering the low-pressure sensor, since its pegged at 55.7, and resetting the adaptations. The goal is 72 PSI with fluctuations.

Video 2. Replacing low pressure sensor. NEW PART (SILVER), OLD (BRASS). Inaccurate sensor reports BAD values to the DME from the low pressure fuel pump.

Video 3. Replacing the LPFP. ($94 at JC Wendy with promotion code)

[CCiCarbon335i]

Did this ever get fixed?

I'm currently experiencing a single 29f2 code, nothing else.
Wierd thing is that I read something that made me want to test the high side pressure sensor