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P0401 Diagnostic Trouble Code Discussion for August 2019

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
1997 Ford Expedition Eddie Bauer 4.6L MIL Lamp on VIN: 1FMEU1768V
P0401: EGR insufficient flow. I have this truck in for a p0401. I with through the EGR testing process by checking the DpFE voltage with the system close and commanded on. I only get about 1.28 at idle with the EGR open. I verified that DPFE was still good by checking with a know good ...
August 11, 2019