The code found P2097 is 1/2 O2 sensor rich (downstream- below the catalytic converter). Your previous code is related to the same O2 sensor.
I would recommend replacing the O2 sensor then go from there. If it returns then you will have to start testing the wiring. I would recommend changing the O2 sensor now if you are able to.
It is simple to replace and easy to get to. The trip would be a good chance after the repair to see if it returns with the number of miles you would be driving.
1. Oxigen Sensoir connector
2. Catalytic Converter
3- Downstream Oxygen Sensor
4. Engine Harness connector.
It can have an effect on engine performance and fuel economy. So the sooner you replace it the better. I dont believe it will leave you stranded on the road anyway by any means so I wouldnt worry about that if you arent able to replace it right away before the trip. If you need more help or have more questions then let me know and I will help you further.
Hope heplp with this (remember rated this post).