Watch the video below to learn how to replace the Inlet NOx Sensor on D13 and MP8 engines. Related ArticlesHigh soot level fault codes Paccar MXDPF Pressure Sensor ProblemsBad AFTERTREATMENT Shutoff Valve on Volvo D13 EngineReplace Outlet NOx Sensor on Volvo D13 Mack MP8 EngineWhat is your DPF system and how does it work?