Ford F-150 - 1997-2003 :: Check Engine Keeps Going Off And On - P0401 Code
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?
View 2 RepliesRodeo :: 2000 - MIL Light Keeps Illuminating With Code P0401 Low EGR Flow
The MIL light on my Rodeo keeps illuminating with code P0401 "Low EGR flow". I had the EGR valve replaced and it ran fine for a while but came back on less than a week later. It was then found to have a leaking intake manifold gasket (which was still covered by warranty) but the code still came back on less than 24 hours later. This has been going on for about 2 weeks and no one around here seems to know why. What else would cause this code to be returned?
View 14 RepliesFord 6.7L Power Stroke Diesel :: 2011 F350 - Check Engine Light Coming And Going - Code P0401
I just picked up a 2011 Ford F350 about 8 months ago. I have had troubles with the check engine light coming and going. Now it's been on for good with loss of power. I have had the codes read and they came up as the p0401 and a code about the def heater. I can not remember that code off the top of my head. After some searching I have found a video about the def heater but nothing about the Egr cooler/valve. Is there anything out there about how to clean and remove the the cooler as I will be needing to do repairs myself as the truck has no warranty.
View 10 RepliesFord - F150 :: Engine Shuddering At Under 2000 Rpm?
2006 for f150 with 107k miles...suddenly started shuddering whenever I give it anymore than a feather of gas, and it's under 200 rpm...after 2000 if seems to break out of the shutter and run fine. Exact same thing happenes to my 89 accura with 230k
View 7 RepliesPrius (Gen 3) :: Check Engine Light On And Code Is P0401
I've read many threads in here, but I didn't find problem of my car. It's Toyota Prius-3 2010, check engine light on and code is P0401. EGR Valve works well, I cleaned pipe, gasket, cleaned throttle plate and everything but nothing works.
I have (light on) it maybe 1 year or more, the light goes away and come back,I'm in Los Angeles and all they time is sunny day and weather is nice, I've seen 3 times, when i drove in rain evening and morning I didn't see light on.. then, couple days and comes again. I think maybe EGR cooler has to be replace? or I do not know why in cold weather time light goes away..
Ford F-150 (2004-2008) :: Misfire Codes / Engine Shuddering Under Acceleration When Cold
My new to me 04 4.6 shuddered and misfired really bad last week, got couple misfire codes. I changed plugs which were really bad, like burnt out to .080, got a HEI ignition tester and got a healthy spark from all the coil packs. Drove it today and ran much better but still would shudder under acceleration when cold, wasn't as bad when warmed up but still noticeable. I thought if I got a spark with the tester that means the coil is ok? or is that not the last word in coil health. Or should I look somewhere else like injectors ? Haven't got any codes since plug change.
View 1 RepliesCamry :: Check Engine Code P0401 - Insufficient EGR Flow
I just got a Check Engine light on yesterday. I went to Autozone and got an OBD-II Trouble Code: P0401, Insufficient EGR Flow Insufficient. The Autozone guy showed me an EGR valve for $164 and said it maybe blocked or something. I also checked with a friend who says that as long as the engine is not overheating it should be okay for driving for now.
So the far the car runs just fine, I haven't experienced any issues out of normal. Does the code mean the value need to be replaced?
Ford Super Duty (1999-2016) :: 2003 F250 - Service Engine Light Keeps Popping On And Putting Out Code P0401
I just bought a 2003 F250 from a used dealer. Unfortunately the service engine light keeps popping on and putting out the code P0401, I have replaced the EGR, cleaned the inside, and cleared the code. However it continues to keep popping up and then it will turn off after a couple of days. I mostly drive in the city and the code generally only pops on when I drive on the highway. I have also noticed a lack or delay of power, when I really hit it hard, I think its because the computer is keeping the egr valve open. What it could be?
View 3 RepliesPrius (2010-12) :: Engine Light Suddenly Get On When Driving - Error Code P0401
I have a Toyota Prius (2010), and the car has run for about 2800000 kilometers. One day when a was driving my Prius the engine light suddenly get on. So I went to a car car mechanic, he checked the car and told me there was an error code (error code: P0401, exhaust problem (exhaust recirculation flow).
So I bought a liquid that I put in the gas tank, the liquid would clean the exhaust pipe, but the engine light was still on. The engine light is usually on at least 2 weeks, then disappear for about 2 days and come back in two weeks…The car is driving normally without any problems.
Camry :: 2000 - Check Engine Light On And Codes Are P0446 And P0401
My camry 2000 recently the engine light's on and the codes are P0446 and P0401
P0401:The PCM has determined that there is insufficient flow in the exhaust gas recirculation system.
P0446: The PCM has determined that a malfunction exits in the electrical circuit fo the vent control in the evaporative emission control system.
Acura - MDX :: 2007 - Check Engine Light Illuminated / Emissions Code P0401 On Nav Screen
I have a new to me 07 MDX with 82k miles. Exactly at 1 mile over the 30day/1200 mile used car warranty the Check Engine Light illuminated along. The NAV screen showed an emissions code P0401. I really don't notice any symptoms in running at all. Anyway a few drives (on/off) and it turns off for four days. It happened again with same code. Again few drives it went off. It seems to happen when driving easy. It gets great MPG in mixed driving on average (20MPG) which is far better than its rating. Should I wait till it stays on steady before I address this?
View 3 RepliesFord Super Duty (1999-2016) :: 2000 - Smoke When Truck Gets To Temperature - Oil Coming Out Of Exhaust?
My truck is a 2000 7.3 doesn't smoke on start up but once it gets to temperature it does. I'm not going through any antifreeze, just oil and it's coming out the exhaust. The truck still runs great starts right up every morning without being plugged in. Any opinions?
View 3 RepliesSubaru - Legacy :: Slight Rough Running With Cold Engine And Stumble Below 2000 Rpm / CEL Misfire Code
I have had some slight rough running with a cold engine and stumble <2000rpm. Finally it tripped a CEL which was read as a misfire code.
The mechanic swapped the coil and plug(recent) and no change. He did a compression test and air blew out the exhaust. So.......the car needs a valve job which entails motor removal and fixing the head and reinstall. He rough estimates this at $2000 and rate is $65/hr.
He mentioned looking at pistons and may be a bit more if rough.
This car well maintained (170,000 miles 2005 Legacy turbo wagon with manual)...
Gmc - Envoy :: Louder Exhaust Noise Than Normal When Start The Truck In Cold Weather
I have a 2003 GMC Envoy with 76000 miles on it. I heard a louder exhaust noise than normal when I start the truck in cold weather. I had it checked and was told that the exhaust system was OK but that the noise was because the motor mounts needed replacing. I have never heard of this before. Before I spend this money I wanted to see what your reply was to this question. Is it common for motor mounts to have to be replaced on this type vehicle with this mileage and age?
View 2 RepliesFord - Explorer :: 2005 - Got P0401 Code With CEL?
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
Ford Aerostar :: P0401 Insufficient EGR Gas Flow Code
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
Ford - Explorer :: 2008 - Got Error Code P0401 With CEL?
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?
View 6 RepliesFord Super Duty (1999-2016) :: Truck Will Not Start When Cold - Code P1378
05 6.0 72,XXX miles. Will not start when cold (below 40ish) outside and engine is cold. Throws a P1378 code and no others (per the BullyDog Gauge Tuner that came with the truck). Checked the FICM with the voltmeter test on a morning it wouldn't start. Never dropped below 48 volts through the whole test. I can clear the code, try and start the truck and it comes back as soon as I try to crank it again. Warm days=no problems at all.
Oh yeah...I did go through the harness from the FICM to the injectors a while back and found a couple spots that were rubbing on various bolts. Peeled the insulation back and taped up the bad spots to keep from grounding something out so I don't think it's a harness issue. Also found a ground wire off on the back side of the FICM and reconnected that on the nearest valve cover bolt.
Ford F-150 - 1997-2003 :: P0401 Code - Vacuum Lines?
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?