EGR Modules, found within the Engine Parts > Engine Miscellaneous section, play a critical role in reducing harmful nitrogen oxide (NOx) emissions in both passenger cars and commercial vehicles. These modules control the Exhaust Gas Recirculation system, directing a portion of exhaust gas back into the intake manifold to lower combustion temperatures. Typically found on diesel and gasoline engines, EGR modules utilize solenoid valves and electronic controls to regulate gas flow based on engine operating conditions. Failures can lead to increased emissions, poor engine performance, and diagnostic trouble codes. Examples within this category include Febi EGR Modules like FEBI175561, Volvo Trucks EGR systems, and components from Pierburg such as FEBI177246, as well as Volvo Construction parts like MPN 22542642.