Question about 2001 Ford Ranger Regular Cab

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Have a 01 Ford Ranger with code of "P0401 EGR flow insufficient". I have replaced my EGR valve twice in 6 months. What is causing the EGR valve to fail so frequently? This has a 3 liter V-6, automatic.

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  • Ford Master
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The problem is now most likely a clogged port in the Intake manifold. In the region of the Airhorn, there is a port or passage that supplies the EGR flow. You need to take off the part that the EGR is bolted to and clean any grooves and gaskets in that area. This is not as bad of a job as in the past, because the air and water systems are usually separate.

The onboard computer is not foolproof. The problem in many different brands is where the sensors are placed. The computer blames the EGR for a low flow and the sensor is downwind from the EGR. The problem is upwind of the EGR at the clogged passage feeding the EGR. The EGR can not possibly put out more than it gets. There is no sensor ahead of the EGR valve.

There are several solenoids which control the opening of the EGR. They have vacuum lines which connect to the EGR. Usually they are a different Error code when they do not work.

You can get a free scan at Autozone or Oreillys and have the info for the place that sold you the EGR. If you bought a defective EGR it may have a Warranty. Good luck on this.

Posted on Oct 10, 2010

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I need to know what the problem the p0401 what is the problem 1999 grand Victoria Ford 4.9


wow I wish ford could make a egr system that wouldn't fail as I've seen this one go a lot lately ! anyways the code is for insufficient flow in the egr system , this is a means to recirculate some of your exhaust back into your intake , as a means to reburn some of your excess fuel (emissions) , anyways it consists of a means to meter some of the exhaust , and control it (off/on) also to measure the amount that goes in , its part of the closed loop of the fuel inlet system , the fault code is specifically saying flow sensor cant detect any flow in the pipe , there can be a few causes for this including a bad flow sensor , all are from my opinion a poorly designed system (it doesn't self clean it's self ) as almost a guaranty every 60k miles your gonna have some problem with it

Feb 03, 2016 | Ford Cars & Trucks

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Why is codes p2106 p0401 on?


P2106 THROTTLE ACTUATOR CONTROL SYSTEM,-PO401-EGR INSUFFICIENT FLOW

May 29, 2014 | 2005 Ford Explorer

1 Answer

96 cutlass supreme will not pass emission in ut. what should I do? KOER failed, trouble code po401


cleanout egr valve and troutle body . Or replace egr with new one, clean, check vacumm lines , check for clogged check , depending on modle of car you can pippoint problem as some have a common part problem depeding with make of car. But all have to do with exaust system. Insufficient flow exaust flow. Im not an expert, all I know it is related to this, I have it myself so im googling it.

Ford EGR valve

The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. Read more how the EGR system works below. What could cause the code P0401 - clogged or restricted EGR passages
- faulty EGR valve
- EGR valve stuck closed
- problems with the DPFE sensor (Ford)
- problems with hoses to the DPFE sensor (Ford)
- problem with the EGR vacuum switching valve (Toyota)
- clogged catalytic converter
- carboned up EGR temperature sensor
- vacuum supply issues at the vacuum-operated EGR valve
- electrical problems with the EGR valve control circuit
- engine computer problems
helpful website helps you with pinpoint and sou;ution related to auto make and model shows you most common cause of code reading.
www.samarins.com

Apr 16, 2013 | Cars & Trucks

2 Answers

Check engine light code P0401 98 Ford expedition


OBD-II Trouble Code P0401 - Insufficient EGR Flow

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

Check it and keep us updated. Hope this helps (remember to rating this free answer).

Oct 13, 2011 | 1998 Ford Expedition

1 Answer

What is causing a P0401 code on a Ford Ranger 3.0L


EGR insufficient flow. Replace the DPFE sensor. Common problem

Sep 23, 2011 | 1999 Ford Ranger SuperCab

1 Answer

Hw do u know wat to do wen the code p0401 pop up


Hi there,

Well done on obtainging this code.

Code P0401 = Insufficient EGR circuit Flow

The EGR circuit consists of i) EGR Valve; ii) actuator solenoid; iii) differential pressure sensor. These components work together to deliver the correct amount of recirculation, depending on engine temperature, load, etc. So, when code P0401 is triggered, this means the computer has detected an insufficient amount of EGR somewhere within this circuit.

So, with this said, the possible causes are:
  • Differential Pressure (DPFE) Sensor is faulty
  • A blockage in the EGR Tube, possible caused by Carbon buildup
  • Faulty EGR Valve
  • Lack of vaccuum to the EGR valve (i.e. valve cannot open)
Note: replacing the EGR valve should only be done, after checking the other components are ok and confirming there is proper vaccuum present.


Hope this helps.....





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Sep 04, 2011 | 1998 Ford Taurus

2 Answers

I have a code P0401. What is this and how can I fix it?


P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

Mar 20, 2011 | 1998 Ford Taurus

1 Answer

Ford Explorer : How to Troubleshoot the EGR P0401 Trouble Code


P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible Causes:
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks
- Faulty EGR valve

Possible Solutions:
- Clean EGR Valve
- Replace EGR Valve
- Repair EGR harness or connector
- Replace EGR volume control solenoid valve
- Replace EGR volume control valve

Jan 24, 2011 | Ford Explorer Cars & Trucks

1 Answer

Engine code p0401 in 2004 ford explorer 4.0 motor insuficient gas flow detected


p0401 is egr flow insufficiant. check or remove and clean egr and port. and also check the vacuum lines to egr. Insufficient EGR flow frequently is caused by clogged EGR passageways.

Aug 19, 2010 | 2004 Ford Explorer

1 Answer

2002 FORD RANGER 6CYL. 4.0L I GOT A P1400 TROUBLE


Exhaust gas recirculation flow insufficient detected.
Maybe you got a bad DPFE sensor, or the pintel inside the egr valve is not opening all the way causing the insufficient flow.

May 14, 2010 | 2002 Ford Ranger Regular Cab

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