When the vehicle is running in closed loop mode, the upstream oxygen sensor reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Also, one thing that could set the code (among other things) is having the two sensors reading very similarly.
Things I would check would be for any type of exhaust leak, a leaky fuel injector, or a misfire. Based on everything you listed, other sensors seem to be working properly.
Wednesday, May 20th, 2020 AT 1:33 PM