We have our check engine light on and the code reads P0401, I think I need to replace the EGR Sensor and found this online. Has anyone purchsed parts here before?

http://www.anrdoezrs.net/click-19127...spagenameZWDVW

 

there is a lot of discussion about p0401 it will probley be one of two things, the vacume port in the intake manifold stopped up and needs cleaning, or if it is the hose mounted dpfe sensor there is a tsb to replace it with a revised one, depending on engine size and year model, may pay to do more checking

 

P0401 OBD-II Trouble Code

Technical Description:
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 (DPF). 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 DPF (differential pressure) sensor is faulty and needs to be replaced
-- There is a blockage in the EGR (most likely carbon buildup)
-- The EGR valve is faulty
-- The EGR valve may not be opening due to a lack of vaccuum

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. There should be a noticable difference in RPM's with the EGR open
-- Clean out the EGR valve to remove deposits
-- Replace the DPF sensor
-- Replace the EGR valve

 

The most common is the DPFE sensor(replace it) or the ports to it are clogged
as stated above use a hand held vacuum pump pull the egr open it should almost stall the vehicle if the egr is clear and working.
Rich

 

canadianmag, WELCOME to FTE!

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