EGR System Explained: What It Does, How It Fails, and How to Fix It What is EGR? EGR stands for Exhaust Gas Recirculation. It is a system found in many modern vehicles designed to reduce emissions by recirculating a portion of the exhaust gases back into the engine’s combustion chamber. Why is EGR Important? The EGR system helps in lowering the combustion temperature, which has several benefits: Reduces NOx Emissions: Lowering combustion temperature helps cut down on harmful nitrogen oxide (NOx)

3 Signs Of A Bad Or Failing EGR Temperature Sensor