I posted about this awhile back but haven't had time to try your suggestions until recently. So after installing new Bosch O2 sensors, after a couple of days, I started getting these 2 codes. From a suggestion, I installed a non-fouler in S1 B1. Drove for a day, no codes, no pending codes and all OF sensors were reading proper outputs .Next day started getting P0430 (P0420 appears to be gone for now) but currently not getting any OF recordings from S1 B2 and S2 B2. Not sure why 2,2 all of a sudden stopped giving readings, maybe just a fluke .

Prior to installing the 18mm non-fouler all O2's were giving output other than 1,1.

Any thoughts for another fix and/or explanation why 2,2 started acting up?

As always, I appreciate all your help.