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
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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.

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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

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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.

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Error code 401

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Please rate this a fixya if you feel the advice is helpful Thanks Randy.

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