https://youtu.be/10kcAY0LJ4M?si=8J5Hm6A8IkOd2j7q
I didn’t read through the entire thread, so I don’t know if you checked this inlet tube that connects to the IAC.
https://youtu.be/vODpt5b2DsM?si=Noaye-Rx1bk1d2b8
this clip is in regards to the strong vacuum at the oil cap.
I understand your frustration and disappointment though, I am in the same boat right now trying chasing down a P2179 code with mines. Haven’t been able to find any solid resolutions on YouTube or google.. I did see that one member here had the code and it was a faulty hengst fuel filter which I happen to have that brand filter on mines but it strikes me odd as to why it’s specific (or indicated to be) to Bank 2. Either way, I’m about to take it to the shop to get smoke tested and go from there.