P0401 FORD - Exhaust Gas Recirculation Flow Insufficient Detected
P0401 FORD Possible Causes
- EGR passage clogged
- Faulty EGR Vacuum Modulator Valve
- Faulty EGR Valve
- Faulty EGR solenoid valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Exhaust gas leaks
First diagnose P0401 FORD code
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Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
P0401 FORD Tech Notes
EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages. If the tubes are clean you may have to replace the EGR Pressure sensor to fix the problem.There is a factory service bulletin for the following Ford models:
2000-2002 Ford Taurus
2001-2002 Ford Crown Victoria
2001-2002 Ford Focus
2001-2002 Ford Mustang
2001 Ford Explorer USPS
2001-2002 Ford E Series
2001-2002 Ford Escape
2001-2002 Ford Expedition
2001-2002 Ford Explorer Sport Trac
2001-2002 Ford Explorer Sport
2001-2002 Ford F-150
2001-2002 Ford Ranger
2001-2002 Ford Windstar
2002-2003 Ford Explorer
Ford Factory Service Bulletin OBDII Code P0401 Code
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Cost of diagnosing the P0401 FORD code
Labor: 1.0
The cost of diagnosing the P0401 FORD code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.When is the P0401 FORD code detected?
Low EGR flow control is detectedP0401 FORD Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0401 Ford Description
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

P0401 FORD More Information
Need more information on how to fix the P0401 FORD code?Get Access to Factory Service Manuals
P0401 Ford Information for specific Ford models
- P0401 1997 FORD F150
- P0401 1998 FORD F150
- P0401 1999 FORD F150
- P0401 2000 FORD F150
- P0401 2001 FORD F150
- P0401 2002 FORD F150
- P0401 2003 FORD F150
- P0401 2006 FORD FUSION
- P0401 2007 FORD FUSION
- P0401 2008 FORD FUSION
- P0401 2009 FORD FUSION
- P0401 2010 FORD FUSION
- P0401 2011 FORD FUSION
- P0401 2012 FORD FUSION
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