Is the bank 2 CAT referring to the left & right side of the Catalytic Converter. Need to understand what bank 1 and bank 2 are. I know this Catalytic Converter has 4 converters.
Codes on 2001 Infiniti QX4
Bank 1 = #1 cylinder side. Locate the #1 cylinder and that is the correct side. Look here for cyl numbering: http://bit.ly/engine_firing_order