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The Exhaust Gas Recirculation (EGR) valve recirculates a portion of the exhaust gases back into the engine’s intake system to reduce nitrogen oxide (NOx) emissions and improve fuel efficiency. A malfunctioning EGR valve can lead to increased emissions, poor engine performance, and potential engine knocking due to improper combustion temperatures. Regularly inspect the EGR valve for signs of carbon buildup, sticking, or malfunction, and clean or replace it as needed according to your vehicle’s maintenance schedule, typically every 60,000 to 100,000 miles. Maintaining a healthy EGR valve ensures efficient emission control, enhances engine performance, and prevents issues related to excessive combustion temperatures.