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DTC P139A - EGR Sensor C Hoses Reversed

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P139A - EGR SENSOR C HOSES REVERSED

Description:  At idle, the exhaust gas recirculation (EGR) monitor commands the EGR valve closed and checks the differential pressure across the EGR tube orifice which should be zero to indicate the hoses are connected and not restricted. This DTC sets when the differential pressure indicated by the sensor exceeds a maximum threshold or falls below a minimum threshold.
Possible Causes: 
  • The upstream hose is disconnected
  • The upstream hose is restricted
  • The downstream hose is disconnected
  • The downstream hose is restricted
  • The upstream hose and downstream hose are reversed
  • Restricted or damaged EGR tube
Diagnostic Aids:  Look for signs of water or icing in the hose. Verify the hose connection and routing. Check the differential pressure feedback EGR sensor for correct mounting and function.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST HE .
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