X5 diesel engine noise - With VID.

[Dr. Anthony]

Hi guys. I don't post much on here, but do browse/lurk.

I have a 2009 X5 diesel and I'm trying to diagnose a noise. It sounds like a screeching.. loud scream. I've posted a video and was wondering if someone has heard this before. I've been searching all week and have yet to find something similar. Sorry for the poor quality video, but it's all I could come up with.

any help is greatly appreciated.
the engine light is related to nox sensor replacement.
currently have 210,000 km (130k miles)

https://www.youtube.com/watch?v=PclB_FxEEPM


***EDIT****
Alright, so I thought I would give an update to my issue. Long story short, its not solved yet. But here's what we did do.


Did a smoke test. Everything was good, except... where the wastegate is on the lower turbo. That's where you can see some soot escaping.. So the wastegate bushings/seals are gone.. and Looks like i'll need to pull the turbo off to get it rebuilt or swapped out.

I feel a bit of play. if I hold it closed, the noise goes away. Obviously I don't want to do this long term. I just wanted to see if I could replicate the noise while holding pressure on the wastegate so it doesn't move. Noise could NOT be replicated.

I also scanned for codes with a different machine and was able to get a few more out of it. I'll update the 1st post to show these for others searching.

they are:



4BB3: Nox sensor before denox cat- plausibility nox
4b6a: Nox sensor before denox cat - Plausibility
46B4: NOX Sensor before denox cat plausability nox.
4C04 - I think this could be EGT temp is too high (non-plausible)
4D16 - SCR system, efficiency: Efficiency too low
46A4 - NOx sensor after DeNOx cat., plausibility NOx: NOx signal offset too high at trailing throttle