The NISSENS Exhaust Gas Recirculation (EGR) Valve, part number 98405, is a crucial component for modern vehicle emission control systems. Its primary function is to recirculate a portion of the exhaust gas back into the combustion chamber. This process lowers combustion temperatures, which in turn significantly reduces the formation of nitrogen oxides (NOx), a major air pollutant. By precisely controlling the amount of exhaust gas introduced, this valve helps the engine operate more efficiently and cleanly. A properly functioning EGR valve contributes to meeting stringent environmental regulations and can also help maintain optimal engine performance and fuel economy. This NISSENS EGR valve is engineered for durability and reliable operation. Regular maintenance and timely replacement of the EGR valve are important for ensuring your vehicle's emission system functions as intended. Symptoms of a faulty EGR valve can include rough idling, poor acceleration, increased fuel consumption, and illuminated check engine lights. This NISSENS 98405 offers a direct fit replacement for the original equipment.