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P0400 Diagnostic Trouble Code Discussion for November 2011

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
2001 Nissan Sentra GXE 1.8L MIL Lamp on VIN: 3N1CB51D31
P0400: EGR System Recirculation Flow. This car came in with a P0400 (EGR Insufficient Flow)I first looked for blockage and found none. I have ested the temperature sensor (this is what the ECM uses to determine the EGR flow) and it was working properly, the voltage drops well below 4.5V as it warm...
November 02, 2011