Durango

Just because it says an O2 sensor means nothing. You have to "graph" how it's monitoring. If it's slow responding- it's likely shot. I have a mini van that showed both heated O2 sensors bad- at $86 each I was going through the steps to figure it out.
Turned out to be a short in the Air fuel meter. A "fuzzy"- ya know a dandelion puff ball somehow got past my airfilter and stuck to the sensor wire. I blew it out with carb spray and compressed air....end of story. Runs like a top.
Need to have something other than a code reader, you need a actual scanner that can "see" what the sensors are doing. Then back up from there. Good luck!