1997 Chevy Suburban Check Engine Light indicates catalytic

I just changed plugs and wires. Engine light now on and readouit says catalytic converter problem, Bank 2. Could I possibly have leaned on something when changing plugs? I took the air cleaner, filter, etc. Off and disconnected the MAP sensor plugs. When done I put everything back the way it was. The only problem originally noted was I reversed #2, #4 wires and went about 6 miles before fixing them. The O2 sensors and MAP sensor were replaced 2 yrs ago. Appreciate your help.