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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.
The EGR valve, or the gas recirculation valve, allows the gas exhaust to enter into the combustion chamber to reduce the volume of the combustible mixture, resulting in a slight loss of power.If the flow from the EGR valve is excessive, the engine will burn fuel inefficiently and experience increased emissions.he EGR valve, or the gas recirculation valve, allows the gas exhaust to enter into the combustion chamber to reduce the volume of the combustible mixture, resulting in a slight loss of power.