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Exhaust Gas Recirculation Flow Malfunction 

P0401 OBD-II Trouble Code:

This code is stored when disfunctioning of the Exhaust Gas Recirculation (EGR) is noted by the Engine Control Module (ECM).

Possible Causes:

  • Faulty EGR temperature sensor
  • Blocked EGR passage
  • Faulty EGR valve

Possible Symptoms:

  • Check engine light turns on
  • Knocking on acceleration
  • Failing of engine emission

Possible Solutions:

  • Change the EGR valve
  • Change the EGR temperature sensor
  • Clean the EGR passage

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