3/17/2024 0 Comments D4ve01b ford engine codesThe 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. 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. The aftertreatment system is equipped with two Nox Sensors and modules.
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