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Have f150 97' 4.6liter with a fault code of p0401. Have already replaced EGR Valve , Air Idle Sensor, cleaned Mass Airflow Sensor,cleaned idle position sensor. Cant seem to find problem. Can anyone help
 

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Have you also checked/replaced the EGR vacuum regulator solenoid and clean the back pressure transducer tubes along with their ports and the manifold tube?


DTC Code: P0401 Description: Exhaust Gas Recirculation Flow Insufficient Detected Probable Causes:
  1. Sensor or solenoid faulty
  2. Connector terminal contact is damaged or corroded
  3. Wire harness - Check harness for correct voltage, open, short to ground or short to voltage
  4. Update control unit software - Check for the latest control unit update
  5. Powertrain or Engine Control Module faulty
  6. Exhaust leaks or restrictions
  7. EGR components clogged, dirty or leaky
  8. EGR valve damaged/defective
 
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