Question about 1998 Ford Explorer

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Code 401 ecg valve ok electric vale ok what else could it be

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This is a frequent Code for many motors. Let me explain how this works. Think of the EGR valve being in the middle of the flow of Exhaust gas. At one end is the exhaust flow coming past the ports inside the intake manifold, at the other end is the measuring device for this flow.

If the exhaust flow is blocked inside the Intake, there is no flow to the EGR, and no flow past the measuring devices at the end. Many times you will need to pull the Airhorn and clean the well beneath the gasket of the Airhorn. This will restore the flow.

On the measurement end of this system, there are 2 Vacuum lines that fit on the DPFE switch connected to the EGR valve. The flow is measured inside the DPFE and if the metal tube is rusted that the Vacuum lines plug into from the DPFE, the readings will trigger the Code 401 for low or insufficent flow. The DPFE switch itself can short out and give the same Code.

On some motors there is a switch in front of the Airhorn and it has Vacuum lines going to the EGR also. This switch usually gives a Code 404. So you will not get a Code 401 from this front switch.

After you clean the Intake or change a rusted metal line, whatever the case, you will need to clear the computer of its Codes. I hope you find my solution very helpful in the repair of your Explorer.

Posted on May 23, 2011

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You need what is called a DPFE sensor will either be silver metal, or if it has been replaced black plastic. IF its a 4.0l engine then its on the drivers side of the intake with two hoses going from sensor to exaust pipe. IF this is a 5.0 V8 then its on passenger side behind throttle body. Basic part number is 9J460

Posted on May 23, 2011

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00 Camry 2.2 egr problem po 401 low flow new egr valve new solenoid new transducer new map clean passages. I don't know what else to do


Here is an overview for the code as it relates to Toyota cars.
I would go back and make sure the tubes and pipes are clear.
In most cases, the passage is plugged up, or the sensor does not "see" the flow.

Possible causes
- EGR passage clogged
- Faulty EGR Vacuum Modulator Valve
- Faulty EGR Valve
- Faulty EGR solenoid valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Exhaust gas leaks


Read more: http://engine-codes.com/p0401

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98 cantour svt code 401


It basically indicates a problem with the EGR valve or the DPFE sensor. Usually, this is caused by blocked passages in the EGR system, not with the EGR valve or DPFE sensor themselves. To clean them, you will have to remove the throttle body.

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1 Answer

401 egr system insufficient flow detected


If the EGR valve is electrically operated, check for its wiring connector to be connected and test the wiring for opens or shorts. If the wiring checks out, the EGR valve may be faulty.

If the EGR valve is vacuum operated, check that the vacuum diaphragm of the valve is intact and not leaking. If the diaphragm won't hold a vacuum, replace the EGR valve.

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Just replace egr valve and dfpe valve as well as cleaning throttle body to try and remove 401 error code now the engine idles faster and 171 and 174 codes are showing up any ideas thanks g.


171/174 too much oxygen in the exhaust, sounds like you may have a vacuum leak after the Mass Air Flow sensor (MAF). Check for leaks in the intake system. Also the MAF sensor could be dirty, clean with electrical cleaner and make sure that it is completely dry before hooking it back up and testing it. Hope this helps, let me know.

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I have a mitsubish montero and keep getting code 401 after putting in a new egr valve I have also replaced O2 sensors and cannot figure out why the code keeps coming up


make sure egr passage way from valve to intake not clogged and make sure exhaust to egr supply is present and make sure if valve is vacuum operated that senser is ok and vacuum supply correct if electial egr senser then intake probably clogged sense code 401 is insuffence egr flow

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Replaced fuel tanks and fuel pumps and filter 1989 f- 150 still wont run


did you check to see if the tank valve is defective? if it's electric the do fail, assuming you have two tanks and the vale can be located in one of two places on the dash or on the floor next to driver seat if the switch on the dash is OK check the switch over valve near the tank, sometimes the switching valve will stick in the halfway position causing it not to pump. If you need help testing this let me know and I can give you instructions on how to do it.

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1 Answer

Engine check light, code 401 low egr vacum egr


The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.

The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

Dec 02, 2009 | 1996 Toyota RAV4

2 Answers

2001 Toyota camry 401 code came up. replaced the


egr position sensor. check items before you replace them, it gets expensive just guessing.

Oct 13, 2009 | 2000 Toyota Camry

1 Answer

Error code 401


The code 401 is for the EGR system meaning that the passages inside the INTAKE MANIFOLD are plugged up with carbon or the EGR valve is faulty, Idle the car, use a vacuum pump to open the EGR valve if the engine does not stumble and nearly 'DIE" then the EGR passages are plugged up or the EGR valve wont hold vacuum Do not just assume the EGR valve is bad before you test first and if it is ONLY ONLY ONLY buy it at the dealer even if aftermarket ones are free!!!!!!!!!!!!!!!
Please rate this a fixya if you feel the advice is helpful Thanks Randy.

Sep 15, 2008 | Mitsubishi Galant Cars & Trucks

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