The EGR system is primarily employed for sustainability systems. The purpose is to return some of the exhaust gases back to the cylinders reducing harmful emissions. In this video, we will learn about the basics of the EGR environmental system (Exhaust Gas Recirculation system) for gasoline and diesel internal combustion engines. The following topics will also be covered: EGR valve, EGR sensor, types of exhaust gas recirculation (external and internal), and the algorithm and principle of the EGR system's operation.