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Exhaust Gas Recirculation Sensor Circuit A Low

P0405 OBD-II Trouble Code:

This is the general code that explains the exhaust gas recirculation (EGR) with engine performance below the specified range detected by the Engine Control Module (ECM).

Possible Causes:

  • Faulty EGR valve
  • Poor wiring
  • Weak connections
  • EGR sensor shorted to ground

Possible Symptoms:

  • Check engine light turns on
  • Stalling of engine
  • Knocking of engine
  • Weak acceleration

Possible Solutions:

  • Change the EGR sensor
  • Change EGR valve
  • Change the wiring
  • Change the connections

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