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1996 Ford F-150 XL with a 4.9 L engine. It has two trouble codes: P0401 Exhaust Gas Recirculation Flow Insuffecient detected P0411 Secondary Air Injection System Incorrect Flow

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  • toby78611 Aug 27, 2010

    Thanks for your help... I was thinking about that yesterday, but wanted to make sure.

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  • Ford Master
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The EGR valve isnt working ,disconnect any vacumn pipes that run to the valve and wires and leave it like that unless you want to fit a new one ,an older vehicle never had this contraption fitted ,they always give problem when vehicle is older so if the vehicle runs then leave it disconnected .

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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What do the OBDII trouble codes P0401 & P0404 mean with 2001 Chevy Impala?


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Trouble code P0401


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Trouble code P0401


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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

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

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P0401 is showing I have a 2005 ford explorer what do I need to change out


P0401 Exhaust Gas Recirculation Flow Insufficient Detected
Remove the EGR valve and clean up passage ways using spray on carburetor/fuel injector cleaner.

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1 Answer

I have 4 codes: 1- p0401 2- p0401 Pd 3- p0403 4- p0405 what do I have to do to get rid of these codes. what are these and where are they located on a 2004 grand am Thx


p0401
Exhaust gas recirculation-insufficient flow detected
p0403
Exhaust gas recirculation-circuit malfunction
p0405
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hope this helps. not sure where they are located

Aug 27, 2010 | 2004 Pontiac Grand Am

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.

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1 Answer

What's wrong with the code P0401 for camry 96


P0401 OBD-II Trouble Code
Insufficient EGR Flow
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