Question about 2002 Ford Focus
PO401: EGR insufficient flow detected
PO402: EGR excessive flow detected
A code P0402 most likely means one or more of the following has happened:
The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum
Posted on Feb 25, 2012
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Posted on Jan 02, 2017
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