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Wiil 2001 ford f150 5.4l not start due to a bad DPFE


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

Dirt Dobber
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SOURCE: Do you have a schematic showing the location for a

Its almost directly in the middle but just to the right, behind the radiator, small square box about 2 x 3 inches with a three wire connector and two short vacuum lines underneath. stand directly in front and look straight down. A high failure item.

Posted on Jun 04, 2010

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SOURCE: Car trouble starting and has

Trouble code P0050 means that the o2 sensor on the passenger side after the catalytic converter is faulty.You need to replace it and reset computer.

Posted on Aug 10, 2011

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SOURCE: does all cars have a DPFE Sensor and how do you test it to see if it is bad?

GM doesn't have the DPFE, Just Ford.

Posted on Jun 13, 2014

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SOURCE: I am working on a 2005 ford escape v6. Will a bad dpfe sensor or bad up stream hoses from the dpfe not allow the car to get over 2000 rpm.

A bad dpfe sensor or the hoses going to it will usually not cause effect an engines RPM, it will only effect the egr valve, in either being stuck open or closed, thus causing either a rough idle, engine ping or a check engine MIL to come on. If the engine will not exceed 2000 rpm, check the operation of the throttle cable to make sure its not loose or stretched by disconnecting the air intake and making sure the butterfly valve opens fully in the throttle body.

Posted on Sep 22, 2015

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2001 ford crown victoria 4.6L engine with codes p1288 and p1401

The 1401 code is for a DPFE switch or connector that is not sending the correct signal the PCM expects. The 1288 code is for a temperature sensor which may be showing a higher cylinder head temperature due to low coolant levels, blockage of water flow or bad thermostat.

The DPFE gives readings of the mix of exhaust gas returning into the intake manifold to be burned again to lower emissions.

The combination of these 2 codes can mean that too much exhaust gas is too frequently going into the intake manifold and is overheating the cylinder head causing the 1288 code. So fixing the DPFE may eliminate this secondary error which may reset itself after the first problem is fixed.

Nov 06, 2013 | 2001 Ford Crown Victoria

1 Answer

2001 buick lesabre volts goes from 14.5 to 12 and car shuts off mid ride and when in neutral. replaced egr cleaned maf still same problem

DTC P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Experience indicates that the most likely solution is to replace the thermostat.
DTC P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low InputThe Manifold Absolute Pressure (MAP) sensor responds to changes in the intake manifold pressure (vacuum). 5 Volts is supplied to the sensor from the PCM (powertrain control module). Inside the MAP sensor is a resistor that moves in relation to manifold pressure. The resistor varies the voltage between about 1 volt to 4.5 volts (depending on engine load) and that voltage signal is returned to the PCM to indicate manifold pressure (vacuum).
This signal is essential for the PCM to determine fuel delivery. A P0107 DTC is set when the PCM sees that the MAP signal voltage is less than .25 volts which is too low. Confirm this measures conditions.

Keep in mind that will need using a scan tool with the Key on and engine running, monitor the MAP sensor voltage. If it is reading less than .5 volts, turn engine off, unplug the MAP sensor and, using a DVOM (Digital Volt/Ohm Meter) check for 5Volts on the 5 Volt reference circuit.

DTC P0401 - Insufficient EGR Flow
This fault code most likely means one or more of the following has happened:
  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum

Now, about the possible solutions in fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve

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.

Aug 23, 2012 | 1993 Buick LeSabre

3 Answers

My 2002 Ford Explorer gave me code P1400. What does it mean

P1400 indicates the following:
Differential Pressure Feedback Electronic Sensor circuit Low Voltage

Most common cause is a bad DPFE sensor.

Jul 15, 2011 | 2002 Ford Explorer

1 Answer

Code p0401 i replaced egr tested omhs@voltage on all related parts @reset code still comes on ?

What have you replaced the EGR valve or the DPFE sensor. The valve usually never goes bad it is usually the DPFE sensor that is bad or the ports in the intake elbow that the valve is bolted to are plugged. If the DPFE tests good pull the elbow and clean the ports. Do you have a vacuum pump?

Dec 10, 2010 | 2000 Ford F150 Flareside SuperCab

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.

Nov 30, 2010 | 2002 Ford Expedition

1 Answer

Where is the egr(dpfe) sensor located in ford explorer-xlt 2002

4.0 SOHC?

If so it will be on the drivers side of the engine. Look for the metal tube that goes into the upper plenum just behind the throttle body. Follow that metal tube and you will see to hoses coming off from it. Follow the hoses up to the DPFE sensor.

It is common for the sensors to stick at a certain voltage. With them unplugged the Computer should default a value of around 5 volts. With it plugged in the voltage should be around 1 volt (key on engine off). Voltage should increase as EGR flow increases. You can supply vacuum to the EGR valve with the engine running. If the engine stalls the EGR is working and the DPFE is most likely bad. If it doesn't the EGR is not working and the DPFE is not your problem.

Also make sure you check the two hoses carefully. They do get old and crack/burn out. If they are leaking the sensor will not be able to sense EGR flow accurately.

97% of the time it is the DPFE sensor. The other 3% are bad hoses, EGR, wiring, etc.

Oct 04, 2010 | Ford Explorer Cars & Trucks

1 Answer

2002 Ford Escape (V6) P0401 P0402 nightmare

Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.

Jul 21, 2009 | 2001 Ford Escape

2 Answers

Got code P1402 sum say it is EGR problem, but that code is P0402 I have check all componets and replaced senser,regarlator,and part right next to regalator. also the code was DPFE senser high voltage any...

code 1402 EGR valve position sensor open or shorted, check the wires going to the sensor and the plug itself,hope this helps if not get back to me and we'll go from there

May 15, 2009 | 2001 Ford Escape

2 Answers

MERCURY 2000 ODB2 CODES P0400, P00A0, P0401

P00A0 is a factory readable only code (i.e. only ford dealers have the computer to read it)
the P0400 is a generic E.G.R. flow restriction code. so yes a dvom (multimeter) and a vacuum pump to diagnose it correctly, also check for loose wires as ford harness connectors are known to fail alot due to crappy phenolic content in the plastic and heat combined they can warp and / or corrode the contacts

Sep 19, 2008 | 2000 Mercury Sable

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