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NGK Electric EGR Valve EGE5-D004 / 94505 with gaskets/seals 5 Pin ConnectorThe Principle function of the exhaust gas recirculation 'EGR' System is to reduce the amount of Nitrogen oxides, also called NOx or pollutants, that are produced during the combustion process.Achieving the right level of return gas is governed by the Engine Management System (EMS) which measures various inputs e.g. engine load, engine speed, boost pressure, mass air flow rate, intake air temperature.The Engine Management System (EMS) calculates the desired EGR return rate. (Diesel max. 30% and petrol up to 18%)The EGR Valve, which is controlled and actuated by the ECU then returns the exact amount of exhaust gas to the intake manifold as calculated by the EMS. The Result? NOx emmisions are reduced.Drive Type : ElectricInfo : with gaskets/sealsNumber of Poles : 5 Pin ConnectorMaterial : Metal