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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.
One of the most common symptoms of a problem with the vehicleâs EGR valve is a rough idle. It is not uncommon for EGR valves to malfunction and become stuck in the open position. This can lead to exhaust gas recirculation to occur causing a rough idle even when the conditions are not desirable.