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Computers rarely fail. The diagnostic would not show anything wrong unless a trouble code is set UNLESS the diagnostic used live data vieew. Most shops dont do that . So at what RPM does it not die? How many miles are on it? Ford uses something called an idle air speed motor. They are prone to fouling.
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).
The p0401 indicates a lack of egr flow. The DPFE sensor (ford basic part number 9J460) is the most common cause of this code. Call a ford dealer for a price and ask if your vehicle is covered under any emissions recall or program for p0401.
From what I can tell with the info I have It has the sound of the IAC it messing up and this is a pretty common problem sometimes you can remove it and clean it but you will need to replace it in the near future.Iac stands for Idle air control
on the other user the first thing you must do is fix the vacuum leak then check the code and if it is a P0401 or so this is caused by the DPFE and it will need replaced it too is a fairly common problem and will cause alot of different drivability concerns.DPFE stands for delta pressure feedback sensor