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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1791 (Engine Controls - Diagnostic Subroutines -- Diesel 6.0L (99P E-Series & 99P F450/550)) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P0401 - Exhaust Gas RECIRCULATION (EGR) Flow Insufficient Detected

P0401 - Exhaust Gas RECIRCULATION (EGR) Flow Insufficient Detected

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P0401 - EXHAUST GAS RECIRCULATION (EGR) FLOW INSUFFICIENT DETECTED

Description:  Calculated expected air in the intake system is less than the actual mass air flow (MAF).
Possible Causes: 
  • Aftermarket intake systems or exhaust systems
  • Restricted air flow (intake or exhaust)
  • Charge air cooler (CAC) system leaks (hoses and cooler)
  • EGR valve position sensor bias
  • Exhaust pressure (EP) sensor bias
  • Restricted EGR cooler
  • EGR actuator
  • Manifold absolute pressure (MAP) sensor
  • MAF sensor
Diagnostic Aids:  There are 3 different entry conditions that can activate the EGR monitor after the EGR valve closed position has been learned. EGR flow command, RPM, desired fuel, EGRVP voltage, engine oil temperature (EOT), engine coolant temperature (ECT) and intake air temperature 2 (IAT2) are values that need to meet specific calibrated levels for the EGR monitor to be activated.
Application    Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST W .
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