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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.
1 There is a blockage in the EGR (tube), most likely carbon buildup. 2  The EGR valve is faulty. 3  The EGR valve may not be opening due to a lack of vaccuum. 4  Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage.