DTC P1406: Differential Pressure Feedback (DPF) EGR Sensor Downstream Hose Off or Plugged
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P1406 - DIFFERENTIAL PRESSURE FEEDBACK (DPF) EGR SENSOR DOWNSTREAM HOSE OFF OR PLUGGED
| Description: | While driving, the EGR monitor commands the EGR valve closed and checks the differential pressure across the EGR orifice. The test fails when the signal from the DPF EGR sensor continues to indicate EGR flow even after the EGR valve is commanded closed. | ||
| Possible Causes: |
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| Diagnostic Aids: | Look for signs of water or icing in the hose. Verify the hose connection and routing (no excessive dips). Verify the DPF EGR sensor for proper mounting and function. View the DPF EGR PID while applying and releasing vacuum directly to the sensor with a hand pump. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP HE31. | ||