![]() ![]() The PCM will turn off the MIL immediately after the monitor runs and passes. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module ( PCM) over the J1939 Data Link. The two NOx Sensor and Module assemblies are not interchangeable. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module which is mounted on the right frame rail. P207F and P20EE, - Answered by a verified Dodge Mechanic We use cookies to give you the best possible experience on our website. The upstream NOx Sensor 1/1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding Nox Sensor Module mounted to the hot side of the engine block. My 2014 Dodge Ram 2500 engine light came ion and says to service diesel exhaust system, see dealer. The aftertreatment system is equipped with two Nox Sensors and modules. ![]()
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