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2000 lincoln towncar code p0401

Customer Question
2000 lincoln towncar code p0401
Submitted: 8 years ago.Category: Lincoln
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Answered in 1 minute by:
6/25/2010
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 8 years ago
Ronnie
Ronnie, ASE Certified Technician
Category: Lincoln
Satisfied Customers: 38,833
Experience: 35 years as an automotive tech
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Ronnie :

Hello

Ronnie :

The code P0401 is in 99% of all cases caused by a bad DPFE (EGR pressure sensor) and in most cases replacing it will resolve your concern. I can send you instructions if you need .

Customer:

yes do you have any diagrams or instructions for the DPFE

Ronnie :

Yes, give me just a minute and i fix you right up.

Ronnie :

Download here

Customer:

THIS IS THE SWITCH THAT I REPLACED AND STILL GETTING SAME CODE

Ronnie :

The DPFE isnt a switch but instead a sensor, if you replaced it with an aftermarket sensor that s likely why. Ford has an upgraded sensor you should use.

Customer:

AUTOZONE DURALAST

Ronnie :

That is likely why, run thru the test and see if its defective.

Check voltage of the DPFE sensor. A normal voltage reading will show 0.5-1.2 volts with the key on or the engine idling.


Check for 5.0 volts between the sensor Brown/White (BR/WT) wire and the Grey/Red (GY/RD) wire.

Customer:

still getting same code

Ronnie :

Did you run the tests I sent, if so what was the results. Also did you used the new Ford DPFE?

Customer:

yes i put one from the dealer and same result now i spent over $200 in parts and im still not able to get this car thru inspection

Ronnie :

Did you run the signal test I sent you and if so what readings did you get,

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Lincoln Mechanic: Ronnie, ASE Certified Technician replied 8 years ago
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Lincoln Mechanic: Ronnie, ASE Certified Technician replied 8 years ago
If the sensor shows correct voltage Key On Engine Off, start the engine and open the EGR valve with a hand vacuum pump. With the EGR wide open at idle, the engine should run extremely rough and the voltage should increase to at least 3v. If the voltage does not increase as it should but the engine is running rough or is close to stalling as it should be, inspect the hoses for the DPFE sensor and replace the sensor as needed
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