The function of the EGR valve is to control the flow of recirculated exhaust gases depending on the engine load. 96253548 EGR Valve For Chevrolet For Lacetti Estate For J200 For Nubira For Rezzo For Tacuma Automobiles Spare Parts. Optimizes the engine's air-fuel ratio for more complete fuel combustion, reducing wasted unburned fuel. EGR valve controls the amount of exhaust gas recirculated to the intake system and reduces the emission of nitrogen oxides in the exhaust gas. It improves overall engine efficiency, resulting in a more stable idle, better fuel efficiency, and reduced oil pollution., Manufacturer: ROUSHI