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Fix code P0400 Exhaust Gas Recirculation Flow Malfunction. EGR stands for Exhaust Gas Recirculation. At high combustion temperatures, the Nitrogen in the air can combine with the air fuel mixture to produce Oxides of Nitrogenâa key component of smog.
When the EGR valve stops functioning, the efficiency of an engine deteriorates. Here are the four prime symptoms that directly indicate an EGR valve failure. The most noticeable symptom is the spark knocking caused by detonation of the fuel within the combustion chamber.