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EGR, which stands for Exhaust Gas Recirculation, comes equipped on most new vehicles, as well as some older models. The EGR valve recirculates burned exhaust emissions back into the intake system so the emissions can be re-burned, or recycled, out the exhaust.
Mechanical EGR valve position sensors are mounted on the top of the EGR valve. EGR pressure sensors will be. located close to the EGR valve as the exhaust gas hose must be connected to the sensor as well as the valve. Will a malfunctioning EGR Position or Pressure Sensor illuminate the check engine.