Question about 2001 Ford Taurus

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Code 0401 egr, also engine seems to missfire or

Code 0401 egr, also engine seems to missfire or hesitate at higher rpm (4000)

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Ok this is a pretty inexpensive problem if you have some basic mechanical skills, and tools. The 0401 code is usually triggered by the egr valve sticking open, or carbon deposits clogging the port into the intake. This acts like a vacuum leak and causes a random misfire situation. Go to your autoparts store and buy an egr valve gasket and a throttle body gasket. Remove the egr vlave and inspect the pintle (the plunger dealie inside there) push it in several times with a small screwdriver and check for sticking. If it appears to be sticking, scrape out what carbon you can and if it has a torx indention in the pintle insert a torx driver of appropriate sixe and turn back and forth while pushing in and out on the pintle to clean. use some carb cleaner to finish cleaning and reinstall egr with new gasket. IF it's NOT stuck, all is not lost but it gets a little harder. If the valve shows no signs of sticking, you will then need to remove the throttle body from the intake, try to do this without unplugging any wires if possible. You can then use a piece of wire (coathanger works well) to clear the port between the egr valve port and intake, remember to stuff some shop rags into the intake before cleaning so carbon bits don't get in there. after clearing the port, reassemble with new gaskets and you're good.

Posted on Nov 11, 2012

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Most likely cause is the DPFE sensor for your code. The misfire is probably unrelated.

Posted on Nov 17, 2009

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What is code 0401 insufficient flow to EGR valve


A code P0401 likely means one ormore 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 vacuum
PossibleSolutionsTo fix this code, it is quite commonfor people to just replace the EGR valve only to have the OBD code return. TheEGR 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 noticeable 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

Mar 07, 2012 | 1994 Ford Taurus

1 Answer

Had P 0401, replaced EGR valve light went off now its back on with same code what could it be?


EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
Symptoms You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
Causes A code P0401 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
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

Nov 26, 2011 | 2000 Chevrolet Malibu

1 Answer

The check engine light is on and @ 4000 rpm thier is a severe hesitation. the oil level is correct and the is regularly maintianed what should i do ? please dont say go to dealer


SOUNDS LIKE MISSFIRE
NEEDS TUNE UP MAY JUST BE A LOOSE PLUG WIRE
CHECK AIR FILTER --- FUEL FILTER CHANGED RECENTLY
MAY BE BAD FUEL PUMP
SCANNING FOR CODES COULD HELP PINPOINT PROBLEM

Apr 19, 2011 | Acura RSX Cars & Trucks

1 Answer

P 0401 code "Insufficient Airflow" STILL!! 1996


the exhaust path there must be clear
end to end, its NOT air that is EGR fail for exh. flow, for EGR only.
which engine, ?????
no 2 engines made use the same flow.
so..........????????

Mar 20, 2017 | 1996 Isuzu Trooper

3 Answers

1999 Lincoln Continental 4.6 32v engine...idles smooth in park & in gear. In park I get a engine miss when revved to 4000rpm. Also seem/feels like I have a miss at lower engine speed when being driven....


hello, i first must ask why that engine would EVER be reved to 4000 RPM? it is likely you are up against the rev-limiter and your ignition is made not to over rev. be very careful....4000 RPM on that engine could/will severly damage your tourque convertor........very expensive it is common for the EGR passages on that model to plug up with carbon, remove valve, clean ports, and retest for low speed miss/hesitation, good luck....marty

Jun 04, 2009 | 1999 Lincoln Continental

2 Answers

OBD code 0401 (1997 Toyota Camry 4 cyl)


There is a VSV (vacuum switching valve) , usually mounted on the back side of engine block, under the intake manifold, as well as the map sensor, that can also cause that code if one or the other is faulty. It takes some pretty detailed troubleshooting to confirm this in some cases, so if that's not in your line of work, you may have to have it properly diagnosed, or take a 50/50 shot at which one first.

Jan 24, 2009 | 1998 Toyota Camry

2 Answers

Ive got a focus st170 and about 4000 revs it seems to missfire


  If you mean in neural it misses this is normal. It has a rev limiter to save the engine. You are bouncing it off the chip at 4000 rpm.

Oct 19, 2008 | Ford Focus Cars & Trucks

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