Question about 2001 Mercury Sable
DTC P0401 - Insufficient EGR Flow
What does that mean? 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
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
Hope helps (remember comment and rated this).
Posted on Jul 14, 2010
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Posted on Jan 02, 2017
Barring any vacuum leaks, P0401 is indicative of a bad EGR valve. Hope this answers your question. Best of luck.
Posted on May 30, 2009
The dpfe is located at the back of the intake manifold on a metal bracket it has an electrical connector coming from it and 2 rubber hoses that go down to the exaust manifold
Posted on Dec 27, 2009
insufficient egr flow usually the dpfe sensor located in the back of intake manifold or mounted
on firewall.if you follow the wires/vacuum line from the egr valve you'll see it. common problem
& fairly easy job pick up a new 1 so you no what it looks like
Posted on Jun 19, 2011
P00A0 is a factory readable only code (i.e. only ford dealers have the computer to read it)
the P0400 is a generic E.G.R. flow restriction code. so yes a dvom (multimeter) and a vacuum pump to diagnose it correctly, also check for loose wires as ford harness connectors are known to fail alot due to crappy phenolic content in the plastic and heat combined they can warp and / or corrode the contacts
Posted on Sep 26, 2008
usually caused by clogging or bad valve. Valve can fail by clogging, torn diaphram, or bad/loose vacuum actuation hose. Exhaust gas recirculation (EGR) system - insufficient flow detected Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM Your EGR valve should be on top of the engine in the front between the intake manifold and the pulleys. It looks something like this:
First, make sure the vacuum hose is good and run it down to where it connects to the intake manifold to check for any leaks. If that's good and you want to get your hands dirty, take the valve off and see if it's clogged. clean it and see if you can actuate it with vacuum (put a vacuum hose on it, ****, and see if it will open. Also, look to see if there is gunk in the line and intake where it connects. Clean out anything you can with carb cleaner.
If you can get it unclogged and the valve is working, put the valve back on with a new gasket, else buy a new one ($40 at autozone :o( ). If you solve the issue, the engine light should clear after a couple hours of driving. OK?
Exhaust gas recirculation (EGR) system - insufficient flow detected
Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM
Your EGR valve should be on top of the engine in the front between the intake manifold and the pulleys. It looks something like this:
Posted on Oct 16, 2010
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