P1406 - Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1406 - DIFFERENTIAL PRESSURE FEEDBACK 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 differential pressure feedback 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). Check the differential pressure feedback EGR sensor for correct mounting and function. View the DPFEGR 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 | refer to PINPOINT TEST HE . | |||