Last time I had an oxygen sensor alarm, I contacted Honda and found out that depending upon your serial number, there is a "kit" for replacing the sensor and "reseting" the parameters for the alarm.
Mine needed the new sensor, a replacement manifold, and the "flash" of the computer for the new parameters. Essentially, Honda told me the alarm is a "false" alarm and with the parameters now being larger, you shouldn't get an alarm
Threaded Mode