p0401 service code is bull
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New User
Joined: Jul 2011
Posts: 2
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p0401 service code is bull
ive replaced the egr valve and the dpfe sensor and the problem keeps coming back. im clueless of the problem because the dpfe sensor keeps getting alittle mosture in the valve line ports
Senior User
Joined: Aug 2009
Posts: 304
Likes: 2
Here's the best sight I've found for checking the egr system.
Part 1 -How to Test the Ford EGR Valve and DPFE Sensor.
Part 1 -How to Test the Ford EGR Valve and DPFE Sensor.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Your wanting to think the issue it to simple and get upset when throwing parts at it don't get results.
A 401 code is the fault code for a low flow rate test done by the computer.
The code does not tell you what to replace.
The path can be plugged, the DPFE may be faulty, the EVR may be sticking closed, hose may be split, the EGR may not be able to open the required amount for the test.
It is simple to prove both the EGR is good and the passge is open by a simple test of trying to open the EGR with outside vacuum.
If the motor idle becomes rough both the EGR and passages are open and good.
This leaves the DPFE, the EVR and hoses for a fault.
When replacing the DPFE only use a Ford OEM part.
It is normal for moisture to appear at the DPFE ports because the exhaust is high in consentration for it especially in high humidity. The device is cooler and condenses it more easily.
Do the testing to either eliminate the parts or see the fault during the test.
The computer does the test and needs to see two failures in a row to logic it a fault after you clear the code or get the fault cleared.
Good luck.
A 401 code is the fault code for a low flow rate test done by the computer.
The code does not tell you what to replace.
The path can be plugged, the DPFE may be faulty, the EVR may be sticking closed, hose may be split, the EGR may not be able to open the required amount for the test.
It is simple to prove both the EGR is good and the passge is open by a simple test of trying to open the EGR with outside vacuum.
If the motor idle becomes rough both the EGR and passages are open and good.
This leaves the DPFE, the EVR and hoses for a fault.
When replacing the DPFE only use a Ford OEM part.
It is normal for moisture to appear at the DPFE ports because the exhaust is high in consentration for it especially in high humidity. The device is cooler and condenses it more easily.
Do the testing to either eliminate the parts or see the fault during the test.
The computer does the test and needs to see two failures in a row to logic it a fault after you clear the code or get the fault cleared.
Good luck.
Posting Guru
Joined: Jan 2000
Posts: 2,281
Likes: 4
From: colbert washington
Just changed my egr according to the code. It did not fix the problem turns out the two intake ports to the egr in the bottom half of the throttle body housing were plugged solid. I mean solid. I had to get carb cleaner and a drill bit to get the carbon out it was so packed in there. Once i got that done truck is running fine again. If you remove the egr and look in that port I dont think you will be able to see where the blockage is without removing the throttle body. Good Luck.
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Posting Guru
Joined: Jun 1999
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clean the throttle body adapter while off the engine before you put any more parts into this problem....
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Posting Guru
Joined: Jan 2000
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From: colbert washington
I did mine while it was off the truck. Having done it once that way I do think now it could be done while still installed on the truck. Just remove the egr valve and the upper housing of the throttle valve. With air, carb cleaner, and a good sharp drill bit or dental pick I think the lower half or TBA could be left in place and the EGR ports cleaned out.
Fleet Mechanic
Joined: Aug 2002
Posts: 1,899
Likes: 29
From: Raleigh USA
I would not advise doing it that way unless you can trap all the carbon. You don't want those big chunks falling into the intake. They could get stuck under a valve or bridge a spark plug gap. The best way is to remove the TB adapter.
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