Sensor, Particulate Matter: Description
WARNING: This page is about a different car, the 2017 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The Particulate Matter (PM) sensor (1) is located in the rear of the Selective Catalyst Reduction (SCR). The function of the PM sensor is to measure the tailpipe soot and to prove the Diesel Particulate Filter (DPF) is working according to On Board Diagnostic (ODB) requirements.
The PM sensor module (2) is only serviceable with the PM sensor.