That's a pic of the TB elbow where the EGR ports terminate.

These two holes are where the EGR valve sends exhaust gasses back into the intake system to take up space thus reducing the need for fuel and oxygen and inturn keeping the cylinders cooler.

 

Check engine lite:
There are at least three stratagies the PCM uses for fault handling.
If the fault is intermittant enough times within a given period, the PCM will store the code only and may not light the lamp.

If the fault occurrs and clears within a given peroid of time, the lamp will light then go out when the fault clears and may or may not store a code.

If the fault is hard and stays, the lamp lights and a code stored.

It is always good practice to clear codes after the work is done especially on mutiple codes so you can see the results of the work and see if any codes return.
Not doing this subjects you to looking at past history and causes confusion.
Don't always count on the lamp going off after repair without clearing or cancelling with a scanner.
The side effect of clearing code by removing the battery cable is the PCM is cleared of not only the fault codes but also the running parameters that have been built into the tables by the learing process.
This requires the truck's PCM to relearn, over time, your driving habits and will make the truck seem to run differently until this relearning process is about complete assuming there are no system faults still causing drivability problems.

 

wcluttrell:

Go back to page 1 in this thread towards the top and click on the link I posted about what I did this past weekend. Read thru and take note there, youll find all the answers you'll need. This is a very effective repair. The pic that Ted98 posted is a good pic, youll see when you get your throttle body off.

 

Okay, guys..

I took the throttle body off and it wasnt that dirty at all.. took the IAC sensor off and no carbon build up there...

NOW,, im getting a code P1401 - DPFE EGR Circuit high input.

Last time it was insufficient flow EGR..


I changed the EGR Vacum selenoid out wiht a new one and dont feel a difference in the vacum to the EGR Valve.

Light is still on.

-Chris

 

just FYI... my truck runs FINE.. no stuttering,, or rough idle or anything,, REALLLLY thinking it is the DFPE sensor.

-Chris

 

ford extended the warrant to 5 years on the DPFE. give your dealer a call and see if you qualify.

 

LEE,, even if the sensor is the "NEW TYPE"..?????

FYI,, i went to AUTO ZONE and priced a DFPE sensor,, and it was 66.00 but it was the "Old Type".. the big silver one.

I have the small black one, not mounted next to the EGR valve.

-Chris


IF ANYONE HAS ANY INFORMATION ON GETTING FORD TO FIX THIS SENSOR.. please give me a shout.....I bought the truck used.. and it had 34,000 miles on it... never been into the dealership since I owned it (a year almost)....

 

Extension Warranty Program number – 02M01 5 years / 60,000 miles That there covers ALL cost for replacing the DPFE. From my research I have found that my code P0402 and another code of P0401 are usually linked to a faulty DPFE.

My 2001 Expedition 4.6L had the code P0401 at 46k miles. The dealer said that it was the probably the EGR valve and that the fix was about $200. I asked the dealer if my VIN qualified for warranty extension 02M01? They checked, said yes, asked how I knew about it, and fixed it for free (bill said about $55). It was the DPFE.

Tim

 

OKay,, from what I understand.. the OLD DFPE sensor the was BIG and silver and mounted on the bracket next to the EGR valve was supposed to be replaced under warranty by a NEW DFPE Sensor that is SMALL AND BLACK.

I HAVE THE "NEW" sensor if that statement is correct. Would it still be covered under warranty if the assumption that it has already been replaced by FORD and has went bad again since the recall??????????


-Chris

 

TTT = To The Top

 

Just checking in to say that it has been mentioned in a past thread that 95% of the time the p0401 code occurs due to a bad dpfe sensor. I think that statement is valid as it is reported that replaceing the DPFE sensor fixes the problem most of the time. If you have the 4.6 engine then it is best to check the upper intake plenum ports to make sure they are not clogged if the vehicle has quite a few miles on it before you replace the DPFE sensor. This has all been mentioned in the replys in this thread except the 95% probability that a faulty DPFE is what causes the P0401 code.

 

TEMP1 SAID...""This has all been mentioned in the replys in this thread except the 95% probability that a faulty DPFE is what causes the P0401 code."""



okay,, so whats the mathemtical probability that it is a bad DFPE sensor if I get the INSUFFICIENT AIR FLOW error code one time,, then get the HIGH EGR CIRCUIT FLOW error code the next time.???

-Chris