DTC P1406: Differential Pressure Feedback (DPF) Sensor Downstream Hose Off Or Plugged
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Mariner, and 2006 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1406 - DIFFERENTIAL PRESSURE FEEDBACK (DPF) SENSOR DOWNSTREAM HOSE OFF OR PLUGGED
| Description: | While driving, the exhaust gas recirculation (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 correct mounting and function. View the DPF EGR PID while applying and releasing vacuum directly to the sensor with a hand pump. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test HE . | ||