Oxygen Sensor codes can be caused by bad converters. It's a tough thing to troubleshoot. The may I diagnosed by bad converter was with my non-contact infrared thermometer. My bad converter was running hotter than the converter I didn't think was bad, there was a 100 degree Farenheit difference.
The only code that would be an O2 sensor for sure would be an "Oxygen Sensor Heater Circuit" code. I just did a ton of work on my MO including these parts. I recommend replacing both cats and all four oxygen sensors. I know it's expensive, but if its a high mileage car then you will benefit from replacing all of these.
Hope this was helpful.
My Murano always needs Maintenance.