When Monitored:
WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
This monitor runs when the engine is running, the coolant temperature is above 176°F (80°C) for 20 seconds, the NOx Catalyst outlet temperature is above 266°F (130°C) for 20 seconds, the exhaust system is not in regeneration mode, and the vehicles accelerates and decelerates repeatedly.