“DETROIT DIESEL DIAGNOSTIC LINK DDDL 8.20 SP1 2025” has been added to your cart. View cart
The NOx sensor measures the amount of NOx in the exhaust system. The NOx sensor is connected in the J1939-2 data link. This diagnostic trouble code (DTC) indicates a NOx monitoring failure. For example; NOx sensor short- or open circuit, NOx sensor removed, NOx sensor missing signal.
Observable symptoms
1) None
Probable cause
1) Sensor not mounted in exhaust stream
2) Faulty sensor
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