Fault Code P-1416

I have my daughter's 98 Z-28 i am trying to help get inspected and when checked it came up with a fault code P-1416. I have a fault code book that describes this as Air System Bank 2. All i have been used to working with over the years are the old Chevys before darned computers. Can someone tell me what Air System Bank 2 is ???????
thanks for any help
fred