When Monitored
WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic monitor consists of two separate checks. The first check occurs when the engine exhaust temperature at NOx Sensor 1/2 is above 150°C (302°F), and the engine is in a decel condition and zero fueling. The second check occurs when the engine exhaust temperature at NOx Sensor 1/2 is above 150°C (302°F), and the calculated NOx value is changing.