Set Condition
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module detects that the NOx Sensor 1/2 reading is not reading zero during decel condition and zero fueling for two consecutive trips or the PCM has detected that the NOx Sensor 1/2 reading is not changing with engine conditions for two consecutive trips.