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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 same symptoms that indicate a bad EGR valve can also indicate problems in other parts of the system. For instance, you can confuse engine performance problems stemming from a bad EGR valve with problems caused by failures in the spark plugs, the spark plug wires, the fuel filter, the fuel pump regulator, and various engine sensors.