Upon closer inspection I did find a crack in the 1/2" hose going to the right bank. I guess that's bank 2? Not sure why it would cause a fault in bank 1 but I'll replace it, reset the codes, and see how it does.

While I had everything off I was going to remove the MAF and clean it. The book procedure didn't work. I disconnected the harness and hose. I loosened the lock ring thingie (although it was already broken on 1 side so didn't do much. I then pressed on the tab at the bottom. The book says it should come right out but it didn't budge. There looks to be another lockring holding it to the manifold but the book said nothing about that one. So I'll just leave it alone for now. I don't want a simple hose replacement to turn into a 2-week headache.