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Exhaust Gas Recirculation (EGR) in automotive engines is a system designed to reduce harmful emissions, particularly nitrogen oxides (NOx), by recirculating a portion of an engine's exhaust gases back into the combustion chamber. This process dilutes the air-fuel mixture, lowering combustion temperatures and reducing the formation of NOx. The EGR system typically consists of an EGR valve, which controls the flow of exhaust gases, and a cooler to reduce the temperature of the recirculated gases before they reenter the engine. This system plays a crucial role in meeting modern emission standards while maintaining engine performance.