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Old 11-11-2010, 20:15   #1
Big Geoff
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Engine Management Light

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.
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Old 11-11-2010, 21:07   #2
GlanzaV
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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
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Old 11-11-2010, 21:08   #3
GlanzaV
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Looks like a faulty EGR valve - might be gunked up.
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Old 11-11-2010, 21:22   #4
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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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