The EGR valve reduces nitrogen oxide emissions by recirculating a portion of exhaust gases back into the engine intake manifold. F2CZ9D475A F6ZZ9D475CA Exhaust Gas Recirculation (EGR) Valve For For Ranger For F150 For F250 For Windstar For Aerostar For Lobo 1997-2003. Reduced exhaust pollutants: Introducing some exhaust gas into the intake manifold and back into the cylinder lowers combustion temperature, reducing nitrogen oxide emissions. Robust & Durable: Manufactured from materials capable of withstanding heavy loads, it contributes to improved vehicle stability and responsiveness. Exhaust gas dilutes the air-fuel mixture, reducing combustion intensity, resulting in smoother operation., Manufacturer: zeshibai