Question about Ford F-150

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'03 Ford F-150, 5.4 L. w/ P0405 code. Replaced one split/melted DPFE Sensor hose and sensor to no avail. Removed and inspected EGR that found to be O.K. Vacuum Regulator resistance and voltage within limits. Still have code, rough idle & poor engine performance.

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  • rmumford Aug 30, 2010

    I performed EVR cleaning as suggested and checked for vacuum at the valve. I did not feel vacuum in either condition but some slight pulsing air movement. I connected my vacuum gauge which registered no vacuum. The AutoTap data was helpful but as I am using another brand of scanner I am hoping that normal drive cycle will resolve the problem.



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First off, EGR valves seldom fail. Yours probably had nothing wrong with it in the first place. 
DPFE sensors, OTOH, have been a problem for Ford for years. Best results have been obtained with the upgraded Ford replacement. 
Make certain the hoses to the DPFE sensor did not get reversed and are not clogged if you have the non-plug-on version. If the upstream hose is getting blown off or is over-pressurized, clogged cats could be the issue.  
Check the Vacuum line at the EGR valve for vacuum at idle and while reving the throttle. It should not have and vacuum while the vehicle is not in motion. 

It should not have any vacuum while the vehicle is not in motion. 
If it does, you'll have EGR flow at the wrong time which usually causes idle problems and low speed stumbling/misfires. EVR solenoid is either dirty or sticking open. Try popping the cap off and cleaning the filter element and the top of the valve with compressed air. 
It takes a minimum of two drive cycles in which OBDII runs the EGR test for it to turn on the MIL if there are failures.

When the code is cleared typically you have to run through a specific cycle. With Ford a normal driving can take a couple of days to a week or more. There is page that lists the cycle and you can run through it about 45 minutes
Click on the link directly:--
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 28, 2010


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Code 1405

Hi there:

The fault code P1405 in most case is a bad DPFE (Differential EGR Pressure Feed Back) sensor, or, a plugged or cracked hose to it.

Locate the DPFE sensor on the driver side of the intake manifold, and has 2 hoses and a 3-wire electrical connector on it (if the sensor has been replaced, it may be black plastic instead of aluminum).

Inspect the 2 hoses that run from the DPFE sensor to the EGR supply pipe for leaks or blockage. Make sure the hoses are connected securely at both ends.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Oct 04, 2012 | 2000 Ford Expedition

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Ford e150 codes: p0401, p1401 and p0174. read the more details to see what the symptoms are.

Stop, DO NOT replace expensive parts or O2 sensor! Ford Explorer codes p0174 , p0401 , rough idle and check engine light on. First thoroughly check all of the hoses and elbows connected to the intake and EGR (vacuum system) for splits, cracks, holes or tears, this could quickly cause these codes and fixes for less than $10. Check all connectors and the EGR valve sensor it could have a crack as well, inspect thoroughly because a split sensor could appear attached to the vacuum hoses but hoses could just be sitting there not actually attached due to a split or crack. This was my problem replaced the EGR valve sensor and the two little vacuum hoses attached to them for $50-60 with in stock parts at the local parts store. Took less than 10 minutes to replace and is easily accessible, the check engine light turned off immediately without having to reset the codes by disconnecting the battery, idle became normal and fuel efficiency better. If you have THOROUGHLY inspected every hose, connector and elbow and found no issues, clean the MAF with electrical contact cleaner ( let dry) and clean the EGR with carbon cleaner. A dirty MAF or EGR could also cause these codes to pop up. If this still doesn't work, then consider replacing the EGR, if that isn't it then try the O2 sensor. Good luck!

Jun 23, 2012 | 2002 Ford E-Series

1 Answer

I have a tropubleshooting code of P1405. On a ford Expedition 5.4l. Where do i fine the DPFE sensor (DPFE sensor upstream hose off or plugged.. aaECM detected EGR flow in a negative direction with aan

DPFE sensor failures are VERY COMMON on Ford vehicles. However, clogged EGR ports are also very common on 5.4L Ford engines. The DPFE sensor is located on the left side of the engine. It connects to two silicone rubber hoses that connect to the steel EGR tube coming from the back of the engine to the EGR valve. (See picture of the sensor below)

Another common failure is a DPFE sensor that has melted due to excessive exhaust back-pressure. If you find the DPFE sensor melted, suspect a restricted exhaust. (smashed tailpipe, clogged catalytic converter, etc..)


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1 Answer

P1405 code

DTC P1405 - Differential pressure feedback (DPFE) sensor upstream hose off or plugged
Verify both hoses are connected to the DPFE sensor first. Ford has two versions of the sensor commonly used of this generation of modular engines.

The first uses a pair of flexible hoses to make the connections from the EGR tube to the sensor. The hose may fail and cause this problem.

The second type of DPFE sensor is stalk-mounted. The two tubes from the EGR tube come up to the sensor and the sensor is just pushed down onto the ends of the tubes and is secured with hardware.

Inspect to see which type you have and whether there are any obvious connection failures.

Hope this helps (remember to rating this free answer).

Oct 10, 2011 | 2001 Ford Escape

1 Answer


P1401 DPFE (Differential Pressure Feedback EGR) circuit high input: This code is in reference to the actual EGR valve monitoring sensor(DPFE). The actual circuit is damaged, thus, producing false negatives.The silicone rubber vacuum lines going to the sensor could also be faulty, as well. I would suggest to inspect the vacuum hoses that run to and from the DPFE sensor. If the hoses are in good shape; Replace the sensor, itself.

You could also check the EGR valve for faults, as well. If you have access to a hand vacuum pump, you can check the EGR passage quite easily with this device. Once you have gathered your pump; Disconnect and plug the vacuum line going to the EGR valve. Connect the vacuum pump to the EGR valve. Start the car and let it idle. Now, apply a simulated vacuum effect with the hand pump to the EGR valve. Your engine should stumble or stall if the passage is open. If it doesn't, the passage is clogged or the diaphragm in the EGR valve is bad. If the passage is open, it's most likely the DPFE sensor.

Ionization Misfire Detection Module Communication Fault: This code is not a normal ford code. With that said; I would advise to inspect all wiring that is running to the coils on this engine. This code will usually point to a failed coil or coil wire connection. i would also have each coil on this engine tested for their operational value. Check the entire engine harness for pinching or any damage that my be present.

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2 Answers

PO402 trouble is this repaired

Exhaust gas recirculation flow excessive. First things to check is your vacuum hoses to egr position sensor (Dpfe sensor) Egr solenoid & egr valve. If they are off, melted or sucked in they need to be replaced. Usually a specific code will be set for that but not always. Of the three the dpfe sensor also known as egr position sensor is the most common & easiest to replace. Next in order is the egr solenoid. Lastly if it comes to changing egr valve make sure to clean all carbon build up in cavity that egr mounts to. They commonly plug up.

Sep 24, 2010 | 2002 Ford Explorer Sport

1 Answer

Why does our 97 ford f-150 4x4 rev up on rpms to over 4000 all by itself every few seconds ? then it quits and will run fine again for miles? why?

That would be your EGR valve and dpfe sensor. The hoses that connect to the dpfe sensor might need to be replaced or the sensor itself. If the two little blak hoses are bad you will have to get them from a dealer because of the high temp running through the EGR Valve tube. Both control idle speed.

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1 Answer

I am having trouble getting my check light to go off after I had it checked and the EGR valve was replaced. The light comes back on after about 15 miles of driving and the code reads EGR poor flow. I can...

Insufficient EGR Flow Detected

Possible Causes:
DPFE sensor signal circuit is shorted to ground
DPFE sensor VREF circuit is open between sensor and PCM
DPFE sensor downstream hose off or plugged
DPFE sensor hoses both off, loose or damaged
DPFE sensor hoses connected wrong (reversed)
EGR orifice tube is damaged or restricted
PCM has failed
And what sets the code is…….Engine started, engine running in closed loop under steady cruise conditions, and the PCM detected the DPFE sensor input indicated insufficient EGR gas flow. Run the KOER Self-Test, and if DTC P1408 is present, the fault is currently present. This code sets in 2 Trip(s). The light will stay on until the cause is repaired. A bad EGR valve is only on possible cause.

Hope this helps,


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2 Answers

2002 ford focus p0401

Here is a list of possible causes for a PO401, hope this helps.

  • DPFE sensor signal circuit is shorted to ground
  • DPFE sensor VREF circuit is open between sensor and PCM
  • DPFE sensor downstream hose off or plugged
  • DPFE sensor hoses both off, loose or damaged
  • DPFE sensor hoses connected wrong (reversed)
  • EGR orifice tube is damaged or restricted
  • PCM has failed

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2 Answers

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Either the vacuum supply to the DPFE (Delta Pressure Feedback EGR) sensor has been compromised due to a disconnected or broken vacuum line, the electrical connection to the DPFE sensor has come off, or the DPFE sensor itself has gone bad. The sensors are such a high fail item that they are now available at aftermarket venues like NAPA and Auto-Zone.

Check your connection, if it's tight, check the vacuum hoses. There will be two or three depending on the style of your sensor. Regardless of the count, there will only be about a foot of hose to check. If the hose is bad, it will obviously need to be replaced, but it can't be standard vacuum/washer solvent hose due to the application. Your friendly Ford dealer has the hose in bulk. It a silicone compound type hose to better resist the heat. I

f the hose is OK, then the DPFE needs to be replaced. Prepare to shell out around $80 to $100 depending on your particular application. If the new one looks different than the old one, it's OK as long as it has the same number of vacuum ports and the electrical connector is the same.

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