O2 Sensor issues?

[Miami Disco]

I recently replaced my MAF, entire catalytic converter y pipe, and put in 4 new bosch premium O2 Sensors. The truck is running better than ever (at least since I bought it) but now the infamous SES light has returned and I'm getting the following codes: P0161, P1175, P1172. Any help would be greatly appreciated.

[Disco Mike]

Bank 2 sensor 2 has a bad heater circuit and both banks are running lean which does not make a lot of sense since you replace all those parts,
Curious, why did you throw all those parts at it before and what codes did you have then?

[OneRyan]

i don't buy Bosch sensors anymore..

[Miami Disco]

Well The MAF sensor had gone bad and was causing the engine to stall at stops and low RPMs. After unsuccessful attempts to fix it by cleaning it I just went ahead and replaced it. The Y pipe was changed out with both catalytics because mine had gone bad and I managed to pick some up off a disco being sold for parts at quite a bargain (student budget). The O2 sensors were completely fried and considering my terrible mileage I just went ahead and swapped those out.