I am bringing this post back up. I found almost no way that any tool would fit bank 2 , post-cat. I have been working on cars for years and it seems like a lost cause. I soaked the O2 connection liberally with PB Blast before , and during and after using a pry bar was able to get the angle tool (note , on my car there is absolutely NO way a 22mm box wrench will work) from Autozone in there. I still could not turn it as it hits this bank 1 pipe.
I am in no way interested in removing an exhaust manifold to change an 02 - what a crap design BMW.
2000 E46 323i Touring / JB / "BW"
2001 E46 "M3" Touring / Alpine / "WW1"
2008 E90 M3 / Jerez/ 6 Speed / FBO / "M3"
2015 F31 328d / MSport / Alpine/ "WW2"