Ford - Explorer :: 2005 - Got P0401 Code With CEL?
May 16, 2015
I have a P0401 code that just fired today. I tried to clear the code, but it came right back on the drive home. There are no drivability symptoms so far; just the CEL.
It looks like the DPFE sensor is part of the EGR valve on this model. Do the 401 code usually means that the EGR needs to be changed, or if there are other common causes of this code that I need to check? The DPFE sensor fixed the same issue on my Escape, but that was an easy $34 and 30 seconds repair. Looking for some 2004+ year owners' experience (I guess 2002 and 2003 models had the DPFE?).
4.0L V6 engine
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I have a 2008 Sports Trac, with a 4.0 SOHC engine ... 165k miles. Last week my check engine (CE) light came on and the code is P0401 ... too little flow on the EGR system. I first tried cleaning the existing valve - but CE light still came on. So I replaced the old EGR valve, cleaned the SS tube from the exhaust manifold back to the EGR valve and the CE light is still on. I have not driven the truck since I replaced with the new valve ... only fired her up in the garage. Is this something that could possibly clear up given a couple of miles?
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2005 PSD Ex. 4x4.
Drove it a few nights ago and it felt really gutless. Next morning, no start. Well, it tried, but it sounded like it was run out of fuel (had half a tank)and I turned it off. Changed both fuel filters, key on / key off to purge system about 2 dozen times. Still no start.
I have all eight injectors with "injector Circuit Low" code, a P0401 - Exhaust Gas ReCir Flow Insufficient Detected, and P0672 - Glow Plug #2 (which it has had for a few months).
I thought with all of the injectors, it might be the FICM, checked the FICM voltage with Torque during a start and it showed 47V the whole time.
Harness? I did not think running with the glow plug error would be a big deal especially during the summer in So Cal.
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The Explorer ran just fine last week, until I tried to clear a chronic (months) "Check Engine" light. Initially the only 2 codes were pertaining to the DPFE sensor and Cylinder #1 misfire. I found an aftermarket rubber hose from the DPFE that had rotted off. I replaced the rubber hose, and I replaced the #1 spark plug and wire. Instead of simply clearing the codes and turning off the "Check Engine" light, it now shakes to the point where it's barely drivable. 57 mph seems to be the "sweet spot" where the shaking is the worst, but it will also shake under heavy acceleration, and when driving uphill at freeway speeds. Taking your foot off the gas seems to decrease the shaking somewhat. The weather had been unusually cold (for South Texas), and as the weather has warmed-up, the shaking seems to have diminished, so there may be a connection between the shaking and the temperature.
OBD-II Trouble Code: P0301 Cylinder 1 One Misfire Detected
OBD-II Trouble Code: P0401 Insufficient EGR Flow
I have a lot of questions, but do not want to cloud the 1st post of the thread with information that may be irrelevant, so I'll leave it at that. This is my work vehicle and I'm in the middle of a job and am worried that I may be causing permanent damage to the vehicle by driving it. I know I can change-out the DPFE sensor and the ICM, but as they are both non-returnable parts, I don't want to spend the money without good reason.
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I got gas last week and then my SES light came on. I took it to my local auto parts store and used the code reader. The code that it produced was P0456. The guys at the store wasn't useful because he said it could be as simple as my gas cap needs replacing or a much bigger problem. Should I take it to the dealer or is it something I can fix myself?
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My '96 4L developed the infamous P0401 insufficient EGR gas flow code 6 months ago. Rough running. Forgot to license it, now the St. Emissions Test was due before I could get new tabs issued. Finally got some warm dry weather to work on it. Started with the electrical measurements per DPFE graph of EGR flow vs electrical output to the PCM.
Showed the DPFE sensor failed, low V output max 2v. The old OEM aluminum body DPFE sensor was still in the old girl after 16 years. Corroded internally and ext., one hose nipple almost corroded off. Eureka. Put in a new Motorcraft plastic body upgrade. Same darn code.
Retested everything from the EGR vacuum valve that feeds the EGR valve to the new DPFE and then the EGR tube from the exhaust pipe. All tested ok electrically and leak wise. No fresh air leaks in the EGR V or EGR tube.
All pointed to restriction in EGR gas flow when PCM demanded it. Ran small stainless steel wire down the upper EGR tube line nipple to the EGR orifice trying to clear carbon build up, still the same P0401. Poured several cups of paint store acetone down each EGR tube hose with engine off and at 2k rpm to emulsify and dissolve the exhaust carbon out. Engine vacuum sucked the acetone up thru the EGR valve also cleaning it internally.
Let set overnight and took out for test drive. Still P0401. Almost ready to drive the green beast to the crusher of death.
Poured more acetone in the EGR and let set for 2 days prepared for the emissions station test failure then repair at emissions cert. shop with a shop waiver for no effective repair. Decided that the EGR tube or EGR valve were leaking fresh air, rusted and corroded. The end nuts on the tube were rusted away. EGR tube NLA from any source.
Went to the emissions test today and passed flying colors. NO P0401, drove all day on business. Got relicensed.
The old girl runs and drives like a dream, she's actually parked and sleeping in the garage tonight all pretty and shiny with a wash and wax job, got a reprieve from the Jaws of Death
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So here's the background. I recently bought this truck. It's a 97 Ford f150 4x4 4.6l 99w vin code. Anyway Driving it home got a p0401. No problem. I Applied vacuum from other vacuum source to EGR engine stalls. So to me passages are clean in the throttle body. I checked to verify and indeed passages are clean. No while doing so I noticed no vacuum was making its way to the dose valve thing. Strange.... So took the line that runs to the passenger fender to dose off and it was impossible to blow air through.
So I cut out the clogged section found solder in the line. I filled the gap I now created using some 5/32 vacuum line reconnected to test and to my anvil still not vacuum. So I disconnected it again. Went directly to where the yellow/orange dose vacuum line connects to at the passenger fender and to my surprise no vacuum there either. No my question is. Am i suppose to have constant vacuum to the dpse or I'm I just being an idiot. And two if I am suppose to when the vacuum line runs into the passange fender where does it go from there and could I have a major issue in my hands?
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2004 6.0 Excursion.. I had an issue with lots of white smoke. A p0401 code, then the smoke stopped. I removed the egr and cleaned it. All seamed good until two weeks later. Now I have smoke again. Its seems to be only after it is warm. Do I need a NEW egr valve?
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After installing the Sinister Diesel EGR Cooler, a new stock turbo, new EGR valve, and new #7 and #8 injectors, I am still getting the P0401 code. Each of those items needed to be replaced, by the way.
The motor runs fine; it just continues to throw the code. It has been to the dealer, and they can't figure it out. Is there a diagnostic procedure I can follow to hunt this elusive problem down?
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On my 98' f250 4.6L 4x4 .. My check engine keeps going off and on, I finally pulled the code and its the P0401. The truck pings and knocks now and than and idles a tiny bit rough sometimes but overall runs good and gets the same mpg it always gets.....is this a bad egr valve?
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I've had a 0401 code on my truck for the last two years. I've replaced the EGR valve and the dpfe sensor a couple of times, with fomoco parts. Ive also cleaned out the egr tube that comes off the exhaust manifold. In this time I also discovered a couple of vacuum leaks and replaced those. I changed the pcv valve, tried running 93 octane gas, and had a mechanic friend run a special smoke through the vacuum lines to find more leaks. Also put a brand new gas cap. I have an obd computer and cleared the code repeatedly but the light always returns.
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My 2001 F-150 came up with this code and I changed the EGR valve cleared the code and it returned 15 miles later. The truck only has 30K miles and the warranty expired 24 May.
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Have a p0401 code which I need to diagnose and solve. However, I don't believe the symptoms are indicative of the EGR system. Its a 1999 4.6L auto approximately 200k miles. Truck runs fine until it warms up, and then occasionally it begins to act like its missing under load. steady state on the freeway it may have an occasional miss, but put a load on the motor and the miss becomes real bad. This doesn't seem to me to be symptomatic of a P0401 code, but I don't really understand the EGR system enough to be sure. Searching on the forums for other p0401 codes doesn't seem to have the same symptoms.
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Dreaded insufficient EGR flow. I've read I should clean the EGR ports.
I can't really find where these are? I took the throttle body off.
What I should do with this thing? I also get a hesitation on initial take off.
1999 F150 4.2 V6 ... 160k miles on it. Runs good otherwise.
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Has a P0401 code EGR unSufficient flow. Ive read several things that it could be, from a DPFE sensor to the EGR valve it's self our that the port going into the TB could be plugged. Truck drives fine does not have a miss or anything noticeable when driving other than the CEL, trucks a 4.6 with 200k on it. Forgot to mention it sometimes gets a P0455 code but i assumed that is gas cap. or could it be related?
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So I'm about to do the oil and EGR coolers on my 6.0. At one point, or currently, my EGR cooler was leaking, so I've got that gooey residue in the intake, at least around the EGR valve. No dry carbon residue. I wondering what is the best way to clean the intake out, if at all. I have to assume there's some clogging in there, especially since I've had the P0401 code for a while. I just wanted to get this done right once, so I'm not coming back to it again any time soon....
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I have a 2005 Sport trac, just recently, I started my truck and my check engine light was on and my trip counter and odometer went blank, not off, just dashes going across the panel. I recall noticing that my rpms were a little high. I turned off the truck and restarted and after a few minutes it came back to normal. Check engine light went off and my miles were displayed again.
A few days later, it happened again, except this time the rpms were normal, just the dashes and check engine light. I happened to have an obd II with me and I immediately scanned it for any codes. NONE. Few minutes later, back to normal. Scanned again, NOTHING. Its been happening more frequently now, every time i turn on the truck when its been sitting for a while. Like I said, it takes about 3 minutes or so and it goes away. Nothing unusual happens during this time. Motor sounds fine and runs smooth.
A friend who is a mechanic told me that it could be a ground cable for the COIL? that could be loose or damaged? He said its more than likely a ground because it happens when its cold and takes time to warm up and goes away. That if it was a hot it would happen all the time. I have searched online for something similar and have found similar problems but no exact match. I just changed the motor about a week ago. I had problems with the timing chain and broken oil pump.
Due to the amount of damage, cost and time to repair and amount of miles on the truck (180K) I decided id be better off putting in a new(used) motor with 67K miles in half the time for labor. I dont think this makes a difference though, because the first incident happened about a week before the truck broke down and the second about two days before. So Im guessing that the change of motor has nothing to do with it.
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I have a p0401 generic exhaust gas recirculation flow insufficant detected code on my truck I was wondering what would be the first thing to check to get ride of this code? my truck hesitates from a stop while excelerating to several thousand rpm. should I try replacing the dpfe sensor? what does dpfe stand for? do they sell this sensor at oreilys or do you half to get this a the dealership?
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97 4.6.. So it would appear that I have the wild goose chase of codes. The major symptoms are rough idle and very poor performance. I started off by cleaning the egr valve and ports. Then I checked the egr valve itself and watched the valve open and close under a vacuum. I was suspecting the DPFE sensor but I wanted to trying something else first. I was under the Impression that if at idle you apply a vacuum to the egr valve it would cause the engine to "stumble and stall". I did this and there was no change in the way the engine was running. So now I'm lost as to where to go from here.
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I am preparing to combat the old P0401, Insufficient flow issue. While looking at the steps in Alldatadiy the very first decision essentially forks on "EGR System Module" or "Others".
I am just guessing that, since the choice is there, some engines will have one and some will have the other. But I thought I'd come here and see if I could learn a little more about it.
How can I tell what my truck has? I'm sure there is some difference...
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I have a 2000 Ranger 2.5l, 4 cyl. Not long after the truck was purchased, there was a recall for the EGR valve, we took it in had that replaced, no issues. Well 2 years ago we had the P0401 code pop up, we replaced the DPFE and it seemed to fix things. Well a couple of weeks ago the code popped up again, we erased it and it came back a week or 2 later, along with the truck shuddering when the engine is cold. My husband said once the engine warms up the shuddering goes away. To make it more complicated it doesn't always shudder like that, seems to be intermittent. What could cause this problem? Does it sound like the DPFE again? Or something else we are missing?
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