Question about 1998 Ford Expedition
The error code P0401 indicates that the "EGR insufficient flow Detected". I have replace the EGR value,DPFE and the EVR. I reset the error and it runs for 12 miles or so before the light returns?
I would check the front o2 sensors because usually the EGR flow is detected by:
The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.
Posted on Oct 13, 2008
Try to clean out the tubes, it is very common for the tubes to get clogged up with carbon, also check for any breaks in the vacuum lines
Posted on Oct 13, 2008
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jun 26, 2015 | Cars & Trucks
May 31, 2015 | Cars & Trucks
Apr 06, 2013 | Ford F-150 Cars & Trucks
Oct 13, 2011 | 1998 Ford Expedition
Jul 12, 2011 | Hyundai Tucson Cars & Trucks
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.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook 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.
A code P0401 most likely means one or more of the following has happened:
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.
Dec 11, 2010 | 2002 Ford Explorer
Sep 19, 2010 | Toyota Corolla Cars & Trucks
May 06, 2010 | 1996 Toyota Camry
May 06, 2010 | 1998 Mercury Sable
Apr 28, 2010 | 2000 Isuzu Trooper
519 people viewed this question
Usually answered in minutes!