Watch the video below to learn how to replace the outlet NOx sensor on D13 and MP8 engines. Related ArticlesDPF Pressure Sensor ProblemsBad AFTERTREATMENT Shutoff Valve on Volvo D13 EngineReplace Inlet NOx Sensor on Volvo D13 and Mack MP8 EngineWhat is a forced regen?What are Maxxforce, Navistar N-Series and A26 engines? International & Navistar Engines Explained.