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'01 Ford Focus RPM issues. CEL was on, code P0401 (EGR)

Hello! I have a 2001 Ford Focus SE Vetec (not sure of engine size...but it's a manual Vetec?) with some issues. I'm not sure if they're all related or not, so I'm going to list everything. :)

I noticed the car was running different. When you press on the accelerator, the RPM's will rev up to about 3, and then go back down. When they go up, the car accelerates very slowly, but once they come back down and "catch", the car has more power. This happens when the car is stopped, and also during driving (eg. if I have to speed up quickly on the highway).

After a couple of weeks, the RPM's began to bounce up and down (I believe this is called "fluttering"?). This only happens when I'm driving on the highway in 4th or 5th gear, and the accelerator is pressed to the floor. It is more noticeable when the AC is on.

A couple of weeks later, the check engine light came on, with the code P0401 (EGR Flow Insufficient). I took the car to the mechanic for some other work (coolant reservoir was cracked, and cooling fan was not kicking on). He replaced the reservoir, cooling fan, and cooling fan connection, and the check engine light went off. It has not come back on yet (it's been about 2 weeks since the work).

After I got it back, the engine sounded different. There is a lot of vibration until the car completely warms up. I can't figure out where the sound is coming from, but it sounds like the middle of the dashboard, inside the car.

So...is it just something to do with the EGR or DPFE sensor, or do I have more than one problem going on here? Do I need to wait for the check engine light to come back on before taking it back to the shop, or can I take it the way it is? Any help or advice is greatly appreciated! :)

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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dustyboner
  • 338 Answers

SOURCE: I'm getting an engine check light, the OBD-II is P0401.

I would check the front o2 sensors because usually the EGR flow is detected by:

The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.

Posted on Oct 13, 2008

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ewashmidas
  • 362 Answers

SOURCE: 2002 ford focus p0401

Here is a list of possible causes for a PO401, hope this helps.

  • DPFE sensor signal circuit is shorted to ground
  • DPFE sensor VREF circuit is open between sensor and PCM
  • DPFE sensor downstream hose off or plugged
  • DPFE sensor hoses both off, loose or damaged
  • DPFE sensor hoses connected wrong (reversed)
  • EGR orifice tube is damaged or restricted
  • PCM has failed

Posted on Feb 10, 2009

jpstuhr
  • 49 Answers

SOURCE: ford focus with p0401

PO401 is EGR flow insufficent. Replace the EGR valve.

Posted on Feb 11, 2009

polarcycle
  • 1392 Answers

SOURCE: 2002 Ford Escape (V6) P0401 P0402 nightmare

Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.

Posted on Jul 22, 2009

bonedivers
  • 1140 Answers

SOURCE: P0401 code Mercury Cougar 2000. DPFE sensor?

Yes it will. Clean out all the ports for the EGR valve check PCV valve if equipped. Vacuum lines can cause this problem also

Posted on Jul 22, 2009

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1 Answer

Got code p0401 for my 2000 ford winstar sel and my engine light is on can anyone help me?


Hi there:
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.
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.


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

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.


Thank you for using FixYa, have a nice day

Mar 20, 2012 | 2000 Ford Windstar

2 Answers

P0401 exhaust gas recirculation flow insuficient detected


depending on the year make and model of the vehicle, the most likely cause of this code is the DPFE sensor which controls EGR operation.

Jul 14, 2011 | Ford Focus Cars & Trucks

2 Answers

1999 mercury sable engine code p1744,p0401. Failed e check. EGR looks new, replaced egr solenoid then cleared codes. what more can i do about the p0401 code and the p1744 code Thanks


for p0401:
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.

Jul 08, 2011 | 1999 Mercury Sable

1 Answer

How much to fix the P0401 egr problem in a 2001 mitsubishi mirage LS with over 100k miles on it?


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


Keep us updated.

Apr 14, 2011 | 2001 Mitsubishi Mirage

1 Answer

P0401 trouble code on my 2001 Ford Focus it say say's low air flow in the EGR. How con I find the blockage with out replacing the whole system?


check pcv hose from the intake to the pipe under coil. They will collapse and leak. chesk while running

May 16, 2010 | 2001 Ford Focus

1 Answer

2002 Ford Escape (V6) P0401 P0402 nightmare


Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.

Jul 21, 2009 | 2001 Ford Escape

1 Answer

Ford focus with p0401


PO401 is EGR flow insufficent. Replace the EGR valve.

Feb 10, 2009 | 2000 Ford Focus

1 Answer

P0401. P0133, P1131- emmision test


Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.

Oct 16, 2008 | 1996 Ford Taurus

1 Answer

Egr valve insufficient flow detected


You probably pulled a code p0401, insufficient egr flow. Your DPFE sensor is more than likely at fault. There has been a lot of trouble with these sensors. Then reset CEL or disconnect battery for 5 minutes.

Aug 12, 2008 | 2000 Ford Taurus

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