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Exhaust Gas Recirculation Flow Excessive Detected

P0402 OBD-II Trouble Code:

This code is set off when there is more flow of engine exhaust gas recirculation (EGR) through the intake manifold.

Possible Causes:

  • Blocked EGR passage
  • Faulty EGR temperature sensor
  • Vacuum leak in EGR valve
  • Faulty EGR valve

Possible Symptoms:

  • Rough working of the engine
  • Check engine light will turn on
  • Exhaust leak

Possible Solutions:

  • Change EGR valve
  • Change EGR temperature sensor
  • Clean the EGR passage
  • Fix the vacuum leak in EGR

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