When Monitored
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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.