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2002 expedition has code 0401, have replaced the EGR solenoid, light came back on, now what

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Replace differental pressure feedback egr {dpfe} and two silicone hoses

Posted on Dec 13, 2009

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I have a 2003 Ford F-250 6.0 diesel and recently had the engine light come on. I hooked the obdII up and found codes po401 and po460. I replaced the egr valve after cleaning out minimal soot.


code p 0401 is the EGR va;ve but the principle reasons for problems are EGR valve
EGR solenoid
hose blockage and wiring
code p 0460 refers tois the fuel tank level sensor--low input===causes ---wiring short to ground --fuel level sensor--ECm

Mar 22, 2018 | Ford Cars & Trucks

1 Answer

I have a Ford F-150 xlt 4.6 with a p0401 code.


code p 0401 refers to exhaust gas recirculation (EGR) system---insufficient flow detected==== causes ---hose leak/blockage, basic setting not carried our (if applicable)---wiring---EGR valve ---EGR solenoid ---ECM
when you have done everything make sure that you use a scan tool to reset the ECM
Items that you haven't mentioned are wiring and substituting the ecm with a known operational one
bad wiring and connections / ground , broken in side the insulation may cause the problem as well

Sep 25, 2016 | Ford F-150 Cars & Trucks

1 Answer

Diagnostics code po401 honda passport not shifting


code p 0401 refers to exhaust gas recirculation valve (EGR) system insufficient flow detected ====causes --hose leak/blockage --basic setting not carried out (if applicable)--wiring--EGR valve --EGR solenoid---ECM
has little to do with not shifting unless the leak is affecting the vacuum actuator for the transmission
so check for vacuum leaks in hoses in the engine bay

Jul 16, 2016 | 2001 Honda Passport

2 Answers

99 acura code p1491


Code P1491 in Honda/Acura vehicles means insufficient EGR valve lift. Note - this is not the same as 0401 for EGR low flow when you have to clean EGR passage in the intake manifold. If code 1491 is not accompanied with 0401 - that could be faulty EGR valve itself. Try to reset the code, and if it will return soon - replace EGR valve. If, however you see both codes together - cleane the manifold passage before you replacing the valve.

Sep 20, 2012 | Acura RL Cars & Trucks

1 Answer

I have a 0401 code light i replaced the egr valve and reset the computer but the light came back on any ideas?


The port from the valve to the intake might be clogged. You might have to shove something in there to check or spry some throttle cleaner in there. Also there is a vsv electrical solenoid controling the egr that might have failed. It is on the back of the engine and diffficult to see.

Nov 15, 2009 | 1997 Chevrolet Lumina

1 Answer

97 tracer P0401 code won't go away


the light may have nothing to do with the previous fault
run the fault codes again

Sep 11, 2017 | 1998 Ford Expedition

2 Answers

OBD code 0401 (1997 Toyota Camry 4 cyl)


There is a VSV (vacuum switching valve) , usually mounted on the back side of engine block, under the intake manifold, as well as the map sensor, that can also cause that code if one or the other is faulty. It takes some pretty detailed troubleshooting to confirm this in some cases, so if that's not in your line of work, you may have to have it properly diagnosed, or take a 50/50 shot at which one first.

Jan 24, 2009 | 1998 Toyota Camry

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