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Code P0401 -- EGR insufficient flow, 1997 F150, 4.6L 1997 - 2003 F150 ... Diagnostic Trouble Code (DTC) P0401 indicates that Continuous Memory Self-Test has detected insufficient EGR flow. Possible causes: Fault in vacuum supply to EGR vacuum regulator solenoid. EGR valve stuck closed or iced.
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www.ford-trucks.com/forums/119770-code-p0401-egr-insuff...
www.ford-trucks.com/forums/119770-code-p0401-egr-insufficient-flow-1997-f150-4-6l.html
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Page 2-P0401 EGR flow insufficient? Ranger & B-Series ... Check for plugging downstream of the EGR valve. This picture shows just how bad it can be. Both me (98 expedition) 110k and my brother in law (98 F150) had same problem. Codes showed low EGR flow. Tried all the suggestions first, bought new DPFE switches,
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www.ford-trucks.com/forums/115627-p0401-egr-flow-insuff...
www.ford-trucks.com/forums/115627-p0401-egr-flow-insufficient-2.html
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The purpose of the EGR valve is to add some of the exhaust gases to the intake stream. This causes a reduction in the combustion temperature and thus reduces NOx emissions. Of course the EGR could ... AutomotiveHelper.com Message Archive > Ford > Windstar > P0401 EGR Flow Insufficient | P0401 EGR Flow Insufficient...
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www.automotivehelper.com/topic423600.htm
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These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
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wiki.answers.com/Q/What_does_code_P0410_mean_on_a_2001_...
wiki.answers.com/Q/What_does_code_P0410_mean_on_a_2001_corvette
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I have a 97 F150 4.6L throwing a P0401 (EGR insufficient flow). I think I have a bad EGR Vacuum Regulator solenoid. I've disconnected the green vacuum line from the EGR Vacuum Regulator solenoid to the EGR valve and applied a slight vacuum to the EGR valve.
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www.carkb.com/Uwe/Forum.aspx/car-maintenance/6797/97-F1...
www.carkb.com/Uwe/Forum.aspx/car-maintenance/6797/97-F150-EGR-Insufficient-Flow-DTC-P401-EGR-Vacuum-Regulator
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Somebody please help, the check engine light has been on for awhile, i have a obdii handheld scanner and get the code of "EGR Flow Insufficient".
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www.carkb.com/Uwe/Forum.aspx/oldsmobile/925/99-Olds-Ale...
www.carkb.com/Uwe/Forum.aspx/oldsmobile/925/99-Olds-Alero-EGR-Flow-Insufficient
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EGR flow was now more carefully controlled with dual diaphragm and back-pressure EGR valves. Modulating the vacuum to the EGR valve's pull, open diaphragm controlled the flow of recirculated ex- haust.
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www.asashop.org/autoinc/nov97/gas.htm
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This is achieved by a restriction (orifice) in the EGR pipe itself that causes a venturi effect. A pipe on each side of this orifice leads to the DPFE which samples the pressure each side of the venturi. ... P1401 EGR Insufficient Gas FLow detected.
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www.fordscorpio.co.uk/egrmonitor.htm
www.fordscorpio.co.uk/egrmonitor.htm
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I had a CEL with P0401 (EGR Flow Insufficient) and P0402 (EGR Flow Excessive) and it turned out that the DPFE was sticking. It's a pretty cheap fix, I had it done at the dealer for $80. ... Apparently if it even gets pitted a little, and any kind of buildup causes the sensor to register any amount of flow, then you'll get...
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www.explorerforum.com/forums/archive/index.php/t-142678...
www.explorerforum.com/forums/archive/index.php/t-142678.html
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