Robert Hahn

I have a 2017 Silverado 2500HD Duramax recently if I get on the excellerater hard and take foot off quickly (when passing someone) I get code P2297 oxygen sensor (O2) has out of range sensor performance when the vehicle is decelerating for bank 1 sensor 1. I took to a shop they said NOX sensors are good, the only thing they saw was DPF level was 87 percent, and EGT sensor 2 to 3 show 100° difference at idle and 400° when on excellerater. I checked resistance of all EGT's and they read around 215 ohms. Any help would be appreciated.