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  • avatar texases 07/16/12 4:59 pm PST

    Google "OBD II codes P0401" and you'll find this:

    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 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

    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

Answers

  • texases 07/16/12 4:59 pm PST

    Google "OBD II codes P0401" and you'll find this:

    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 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

    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

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