Bank 1 and Bank 2 secondary O2s are plugged.
Bank 1 primary just replaced - cleared line fault.
Bank 2 primary - is this functioning properly?
Codes: Only codes I've seen since Cyl 6 knock event are here
2C9E 'active' Oxygen sensor heater after catalytic converter Activation
2C9F 'shadow' Oxygen sensor heater 2 after catalytic converter: Activation