How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ron Your Own Question

Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 26906
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
7276279
Type Your Ford Question Here...
Ron is online now
A new question is answered every 9 seconds

Ford F150 Pickup 4x2: I have a 1999 F150 2WD with a 4.6L. I

Customer Question

I have a 1999 F150 2WD with a 4.6L. I keep getting the ses light and the guy at the auto parts store says the code is low EGR flow. I removed the EGR valve and it appeared to be working fine. When I checked the DPFE sensor, it had condensation in it from the hoses going to the EGR pipe. So I installed a new DPFE sensor and erased the code, it came back on a week later with same code. DPFE sensor full of condensation again. I also already installed a new EGR control solenoid, still get light.
Submitted: 2 years ago.
Category: Ford
Expert:  Ron replied 2 years ago.
Hello and Welcome to Justanswer, My name is XXXXX XXXXX I am here to try and assist your with your question.

Are you setting the code P0401?
Customer: replied 2 years ago.
yes
Expert:  Ron replied 2 years ago.
The code P0401 does not always mean the DPFE is bad and the fact that you are getting condensation in the DPFE tells me you have a low EGR flow issue and in most cases thats cause by restricted EGR passages.To clean out the EGR passages, remove the throttle body and spacer plate if equipped. Once the inside of the intake manifold is accessible, clean out the passages inside real well and this should resolve your concern. If you need throttle body removal instructions, let me know and I will send right away.

















Please note, your Deposit doesn't constitute a payment. Please be
sure to rate OK SERVICE, GOOD SERVICE OR EXCELLENT SERVICE/3-5 STARS/SMILEY
FACES to complete transaction or ask for more help by clicking REPLY TO EXPERT.


Positive feedback is always appreciated. Please note that if you have a
subscription service you still need to to rate OK SERVICE, GOOD SERVICE OR
EXCELLENT SERVICE/3-5 STARS/SMILEY FACES , however you are not charged again.
Thank you.

Please note the 1 to 2 faces(POOR AND BAD SERVICE) are a
negative rating. Before choosing one of these, please reply first so that I can
further help you. Thank you, Ron.

Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 26906
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Ron and 12 other Ford Specialists are ready to help you
Customer: replied 2 years ago.


I still have the same problem. The manifold and EGR valve are clean, so its not a blockage issue. I have battery voltage at the EGR control solenoid. I can disconnect the vacuum line going to EGR valve and suck on it and here that the valve is operating smoothly. When I start the truck and leave it in park, the EGR pipe stays cool. Then when I put it in gear, the pipe gets hot like everything is working normal. All the vacuum lines appear to be in good condition also.

Expert:  Ron replied 2 years ago.
So which code are you still setting?
Customer: replied 2 years ago.

Still getting the PO401 code.

Expert:  Ron replied 2 years ago.
If you are sure the passages are clear and the DPFE is connected corrected then you may have a defective DPFE. Run the pinpoint test to recheck.Check the DPFE sensor voltage on the scan tool. A normal Key On Engine Off reading will indicate 0.5-1.2 volts.If the DPFE sensor's voltage is outside the normal range, disconnecting the sensor should result in a reading of 5 volts on the scan tool.If the sensor voltage reacts as stated after disconnecting, , verify 5.0 volts is present at the sensor connection between the Brown/White wire and the Grey/Red wire before replacing the sensor.
Customer: replied 2 years ago.


I dont have my own scan tool, i've been going to the local auto parts store to have them check the code. I did take some voltage readings with a meter and this is what i got at the DPFE connector.


disconnected and engine not running: 5v at brown/white to gray/red.


5v at brown/green to gray/red.


 


And with plug hooked up and engine running and warmed up:


1v at brown/green to gray/red


4v at brown/white to brown/green


5v at brown/white to gray/red


 


over the past 4 years, i have put several new DPFE sensors in this truck. It used to keep the ses light off for several months in the begining, but then it started coming back on sooner and sooner. The current DPFE sensor kept the light off for about 1 day, just long enough to get it through inspection. I'm wondering if it has something to do with the CAT converter being restricted or something.

Expert:  Ron replied 2 years ago.
Are you sure the new one insnt defective?
Customer: replied 2 years ago.

The sensor I have now could be bad, but at $60 a pop I always wait til its time to get it inspected before I buy a new one. Every one that I buy works for a little while then when the light comes back on, I remove the sensor and it has water in it. Thats why I'm wondering if the catalytic converter is bad.

Expert:  Ron replied 2 years ago.
Moisture is always a killer on them are you using the new plactic ones?
Customer: replied 2 years ago.


Yep, 100% genuine plastic.

Expert:  Ron replied 2 years ago.
Its not likely the converter plugged up, if so, you would notice a loss in power in most cases.
Customer: replied 2 years ago.

The truck runs pretty good for 192,000 miles, but I have noticed that I cant run 87 octane anymore, or I get pinging under accelleration. 89 or higher and its fine.

Expert:  Ron replied 2 years ago.
With the amount of mile you have on it, you may very well have some exhaust restriction, but it usually dosnt set a DPFE code.
Customer: replied 2 years ago.


I guess I'm just gonna leave it for now. In March when the inspection is due, I'll buy another sensor and hopefully It'll get me through inspection. I just dont know what else to try at this point, that isnt gonna cost a bundle of money.

Expert:  Ron replied 2 years ago.
Okay, let me know if I can help you. Im here every day. I will do what I can.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
< Last | Next >
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
  • Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me. Molly USA
  • I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service. Jason V. Kirkland, WA
  • I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there. BR New Jersey
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.