Question about 1997 Chevrolet Lumina

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I have a 0401 code light i replaced the egr valve and reset the computer but the light came back on any ideas?

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The port from the valve to the intake might be clogged. You might have to shove something in there to check or spry some throttle cleaner in there. Also there is a vsv electrical solenoid controling the egr that might have failed. It is on the back of the engine and diffficult to see.

Posted on Nov 15, 2009

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Code 0401 after all checks out good


You don't say what the make model and year are, so here is a generic reply.
Sometimes the EGR valve is working but the sensor is not. In most cases the computer uses a pressure sensor to tell if the EGR valve is open or not.

Jul 07, 2013 | Cars & Trucks

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99 acura code p1491


Code P1491 in Honda/Acura vehicles means insufficient EGR valve lift. Note - this is not the same as 0401 for EGR low flow when you have to clean EGR passage in the intake manifold. If code 1491 is not accompanied with 0401 - that could be faulty EGR valve itself. Try to reset the code, and if it will return soon - replace EGR valve. If, however you see both codes together - cleane the manifold passage before you replacing the valve.

Sep 20, 2012 | Acura RL Cars & Trucks

1 Answer

Ford Escort P1405 Error Code


Are you sure you have EGR flow?? Hold the EGR valve open the engine should run poorly, if not you have no flow.

May 31, 2012 | 1998 Ford Escort

1 Answer

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

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

2 Answers

Code 0401 egr, also engine seems to missfire or


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.

Nov 17, 2009 | 2001 Ford Taurus

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

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