Introduction: The Exhaust Gas Recirculation (EGR) valve plays a crucial role in the operation of modern internal combustion engines, especially in vehicles with gasoline or diesel engines. Its primary function is to recirculate a portion of the engine’s exhaust gases back into the combustion chambers, which helps reduce nitrogen oxide (NOx) emissions by lowering combustion temperatures. Also, read: Exhaust Gas Recirculation (EGR) However, over time, the EGR valve can develop issues that affect engine performance. Here are some common symptoms of a failing EGR valve and an overview of the replacement cost. Symptoms of a Bad EGR Valve 1. Check Engine Light (CEL) Illumination. One of the most common signs of a malfunctioning EGR valve is the illumination of the … Continue reading Symptoms of a Bad EGR Valve (and Replacement Cost)