Question about 1998 Ford Windstar
EGR common on the Fords usually a DPFE sensor but check valve for proper operation. Make sure it holds vacuum and that ther is a change in engine running condition when vacuum is applied. If no change or if it doesn't hold vacuum repalce valve
Posted on Nov 13, 2009
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
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.
Posted on Aug 19, 2010
Really, code P0401 means 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.
Symptoms: 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.
Causes: 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
Keep in mind this 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
Test, check it and keep us updated.
Posted on Jul 14, 2011
Tips for a great answer:
Feb 28, 2014 | 2005 Dodge Grand Caravan
Jul 03, 2012 | 2008 Chevrolet TrailBlazer LT
Jul 14, 2011 | Ford Focus Cars & Trucks
Apr 06, 2011 | 2001 Ford Escape
Aug 19, 2010 | 2004 Ford Explorer
Jul 29, 2010 | 2002 Mitsubishi Galant
Dec 18, 2009 | 2002 Mazda Tribute
Oct 13, 2008 | Nissan Pathfinder Cars & Trucks
161 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: