Bronchitis is a respiratory disease in which the mucus membrane in the lungs' bronchial passages becomes inflamed. As the irritated membrane swells and grows thicker, it narrows or shuts off the tiny airways in the lungs, resulting in coughing spells that may be accompanied by phlegm and breathlessness.
This will help you easily replace the sensor next time. Thread the new sensor in place finger tight, then tighten the sensor with the socket and ratchet. Plug in the oxygen sensor electrical connector and lower your Accord with the floor jack, if you had to raise it. Reconnect the ground (black) battery cable with the wrench.
If the downstream O2 sensor activity mirrors the upstream O2 sensor, the converter is dead and needs to be replaced. You can also confirm a bad converter by comparing levels of CO and HC in the exhaust fore and aft of the converter.