New Nox Sensor Nitrogen Oxide Sensor for KUMMINS,
OEM:2872236 , 5WK9 6691,5WK96691
If too much DEF is injected into the exhaust, the SCR brick can become saturated with ammonia and some of it will exit the SCR assembly. This is called “ammonia slip”. To a NOx sensor, ammonia and NOx look the same. Ammonia slip will cause the downstream NOx sensor to report an incorrect amount of NOx in the exhaust stream.