Ford P0401 DPFE EGR Pressure Sensor Diagnostics and Repair with a Contest

[svt0304cobra]

crank sensor?

[markjhicks]

@svt0304cobra If it is effecting all cylinders, it is very possible to be a crank sensor or a fuel delivery problem.

Mark Hicks

Wells Vehicle Electronics

[svt0304cobra]

@markjhicks yea i checked fuel pressure suppose to be between 60-70 psi was at 65 and at 3000 rpm only dropped a pound or two then stabilized i got a crank sensor was only $25 figured not to expensive to throw at it, since i have to get the a/c compressor out of the way itll be a job to tackle next weekend so we'll know then

[svt0304cobra]

i swapped coils erased codes took for a quick spin came back checked for stored codes this time i got po300 random/mutltiple cylinder misfire which threw a variety 301 302 304 307 changes when i delete and recheck and last was po316 misfire detected in 1st 1000 revs, i sat in drive for a while and kept pulling the same thing and service eng light would startto flash again, so it seems to be all cylinders are missin at a time like a restriction, any ideas or you come across this before

[svt0304cobra]

k got 2, po304 and po1336 misfire on cyl 4 and manufacturer control ignition system or misfire.... coil over plug??

[svt0304cobra]

ok, took it to my shop got no misfires, ive noticed i get a second long beep and battery light flashed real quick, on my way back home of course after i left the the shop the service engine light flashed oh maybe 30 sec or so then now off, ive had a couple times it was like washboards again then bucked kinda rough till i let off, twice when ive turned and on the gas felt kinda rough like its in 4 wheel drive when you turn all the way one way, ran test on the scanner everything passed

[svt0304cobra]

@svt0304cobra continued......... but to think transmission, ok bad fuel econ about 10 mile what the dash is averg, but still the rough idle noticed rough idle today from cold and havent really smelled any sulfur, tail pipe seemed to smell fairly normal, im wondering after the service engine light falshing fo a period now id have a code stored...

[markjhicks]

@svt0304cobra If the service light flashed or came "on". you should have a stored or a pending code. Let me know what you find.

Mark Hicks

Wells Vehicle Electronics

[svt0304cobra]

i have an 03 eddie bauer 4.6 notice has a rough idle when op temp, driving cruising speeds once in a while will shutter llike driving over washboards on a dirt road, let off gas goes away usually comes back, also has issues shifting accelerating from stop wants to hold the gear, lack of power, but then goes away drives fine powers uphill no problem does it everytime i drive, its stalled twice at a stop, i though dpfe test fine on voltmeter, a couple times smelled sulfur from pipe but not always

[svt0304cobra]

@svt0304cobra to me a plugged cat would always have rough idle and always smell, ive checked for any stored codes and theres none, ive also noticed with a glove at the tail pipe its blowin like it has a large cam in it and when i put my hand over the exhaust almost feels like it sucks in blows out sucks in blows out,can see the glove looks like bein pulled in.... restriction in the exhaust? cat converter? anyone had this and knows id be tickled pink to have a direction to start

[markjhicks]

@svt0304cobra Fist check and clean the MAF sensor. If that does not take care of the problem, I would like to have you put it onto a scan tool. Check the misfire counts. If one or two are particularly high swap the coils on those cylinders and see if the misfire follows the coils.

Let me know what you find,

Mark Hicks

Wells Vehicle Electronics

[svt0304cobra]

@markjhicks wouldnt it sence a misfire i know they do misfire checks soon as you turn the key, and wierd far as mainly doing it when its warmed up, i looked at the mass air didnt seem grimed up or anything i can try cleanin it just to see, anything around the house can use to clean ive heard of using rummbing alchohol and a Q-tip, if that dont work cleaning it i can see bout swingin by the shop i worked at check for misfires, id just think it throw a code though, ill try it

[markjhicks]

@svt0304cobra You have to get enough misfires in a certian time period to set a code. It might be right on the edge. When you say you smell rotten eggs, it means either it is running rich or you have a misfire or both. Please clean the MAF. Please do as I am telling you, it will give a good starting point if not the answer.

Mark Hicks

Wells Vehicle Electronics

[artfd]

Excellent video. My 2001 F150 with 4.2 L V6 had the same code, the same problem & the diagnosis & replacement of the DFPE was the same except for the location of the DFPE on my engine -- it was fully exposed & mounted near the front of the engine. Removing & replacing the DFPE on my model was extremely easy to do.

[markjhicks]

@artfd Thanks for the information and kind words. Take Care,

Mark Hicks

Wells Vehicle Electronics

[DMasterMensionz]

i have this exact same part from wells right in front of me, and it went bad after two and a half months. I pulled one out of a old junk windstar and its still working like a charm

[markjhicks]

@DMasterMensionz It may be an early version, but either way we would greatly appreciate getting it back for an analysis. Give us a call on our tech and we will make arrangements to send you a new one and a call tag for you to send the defective one back. This will all be at no cost to you. Our toll free number is 1-800-558-9770 press 3 for the tech department and explain the situation and one of my guys will make the arrangements.

Thank you,

Mark Hicks

Wells Vehicle Electronics

[MsMlarrea]

I'm receiving a P1401 high voltage on my ford expedition 2001. I've changed the PDFE sensor twice. Any ideas? Thanks.

[markjhicks]

@MsMlarrea

3. Check for a possible backpressure issue which may be damaging the sensor because of exhaust heat melting the sensor internally. To check this, connect a vacuum/pressure gauge to the DPFE sensor tube that connects to the sensors "HI" port. Monitor the reading while brake-torquing the engine. Backpressure should not exceed 2 PSI.

4. If the DPFE sensor connector is ok and there is not excessive exhaust backpressure, replace the DPFE sensor.

[markjhicks]

@MsMlarrea

1. Inspect the connection of the Differential Pressure Feedback EGR (DPFE) sensor for good contact to the sensor.

2. Check the Brown/White (BR/W) wire for 5.0 volts to the sensor when the Differential Pressure Feedback EGR (DPFE) sensor signal reading is high, and, that the Grey/Red (GY/R) wire is a good ground.

Mark Hicks

Wells Vehicle Electronics

[Undertaker331]

thank you, this will really help me, im am currently a student at ohio tech college for their auto-diesel program, and my moms car just put this code on, now i can go fix it today, instead of waiting for monday to take it to school and do it!

[markjhicks]

@Undertaker331 You are very welcome, let me know how it turns out or if you need anything else.

Mark Hicks

Wells Vehicle Electronics

[Coop772]

Great tutorial! Thanks for the upload!

[markjhicks]

@Coop772 You are very Welcome, Thanks for watching.

Mark Hicks

Wells Vehicle Electronics

[IrnMaiden304]

They don't tell you about the DPFE sen's on the older ford's. Made from I do believe aluminium, they build up nasty corrosion and the vaccum lines to the sensor get plug'd with the stuff. Ford later came out with a plastic one to fix thier recall, and don't even think about hitting a yard to find one, they have all been raped of them lol

[markjhicks]

@IrnMaiden304 Yes they were aluminum cases. In fact we manufactured and sold the aluminum housing until the foundry stop producing them. Reason? On some application the plastic replacement needed a new wiring harness, we wanted to produce a direct replacement for as long as possible. the reason ford updates was because of RFI problems. We updated the circuitry but stayed with the aluminum housing as long as possible.

Mark Hicks

Wells Vehicle Electronics

[jdubb408]

answer is D

[markjhicks]

@jdubb408 Go to our website and submit your answer to win. Just click on the link in the description. Good Luck.

Mark Hicks

Wells Vehicle Electronics

[EricTheCarGuy]

The dancing was the best. The smoke effects were cool too.

[37474748]

this is an easy one (giggles) :)