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.
2001 325i Touring / Manual / Alpine White / Beige
2009 CTTS / E81 / Sport Techno / Black / Alcantara
2008 M3 Sedan / Manual / Jerez Black / Fox Red
2005 M3 Cabriolet / Manual / Carbon Black / Black (Wifey, MCase)