Replaced the O2 sensor today with Denso OEM from automedic. Took a
short drive in rush hour and I believe this solved the problem.

I heard that it is good to clear the ECU of codes when you install a
new sensor. Is this true? If so, I heard the radio needs a security
code to function again if the battery is disconnected long enough to
clear the ECU. Anyone know where to find the code?

Thanks for all the help. This is my first Honda, and it's comforting to
know there is such great support online. : )