Engine Management Light

Discussion in 'Leon Mk1' started by Big Geoff, Nov 11, 2010.

  1. Big Geoff

    Big Geoff Guest

    Seat Leon Mk1 year 2003 1.6L

    I have a problem with the engine management light permanently on. Got the code PO402 Gas Recirculation Flow (EGR) Excessive Detected.

    Is there a common fault or a guide on the forum to find the cause.

    Help appreciated.
     
  2. GlanzaV

    GlanzaV I start fires!

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    16786/P0402/001026 - Exhaust Gas Recirculation (EGR): Excessive Flow

    Possible Symptoms
    • Malfunction Indicator Light (MIL) ON
    • Reduced Exhaust Gas Recirculation (EGR)
    • Reduced Power Output/Engine running rough
    • Increased Emissions
    Possible Causes
    • Exhaust Gas Recirculation (EGR) Valve stuck open/leaking/faulty
    • Exhaust Gas Recirculation (EGR) System leaking/faulty
    • Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty

    Possible Solutions

    • Check/Clean Exhaust Gas Recirculation (EGR) System
    • Check/Replace Exhaust Gas Recirculation (EGR) Valve
    • Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve
     
  3. GlanzaV

    GlanzaV I start fires!

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    Looks like a faulty EGR valve - might be gunked up.
     
  4. Roohul

    Roohul Full Member

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    A code P0402 most likely means one or more of the following has happened:

    * The DPFE (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

    With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.

    * Check the voltage at the DPFE sensor both at idle and when the EGR is open
    * Replace the DPFE sensor
     

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