Why p1157 AF Voltage high after catalytic replacement?

Aftermarket catalytic converters are not very reliable ..

I've seen multiple concerns like this after cats have been stolen on Elements...in Northern California where my dealership is. I can tell you that if the oxygen sensors were damaged or cut, aftermarket sensors are horrible. Also, I've seen them wired in reverse on accident -- pre-cat sensor harness plugged into after-cat harness, and vice versa. The aftermarket catalytic converters on these vehicles appear to be CARB certified and functional -- it's the wiring and oxygen sensors that get messed up from what I've seen. Go original Honda sensor if an aftermarket has been installed, and ensure the right harness is plugged into the right sensor.