Set Condition
WARNING: This page is about a different car, the 2016 RAM 1500. 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/ reading is not reading zero during decel condition and zero fueling for two consecutive trips or the PCM has detected that the NOx Sensor 1/1 reading is not changing with engine conditions for two consecutive trips.