DTC P0406: - Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0406: - EXHAUST GAS RECIRCULATION (EGR) SENSOR A CIRCUIT HIGH
| Description: | The EGR monitor checks the EGR sensor signal to the powertrain control module (PCM) for high voltage. The test fails when the average voltage to the PCM exceeds the maximum calibrated value. | ||
| Possible Causes: |
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| Diagnostic Aids: | A DPFEGR PID reading greater than 4.5 volts with the ignition ON, engine OFF or running indicates a hard fault. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Crown Victoria, E-Series, Explorer 4.0L, Explorer Sport Trac 4.0L, F-150 4.6L 2V, F-Super Duty 6.8L, Grand Marquis, Mountaineer 4.0L, Mustang 4.0L, Mustang 5.4L, Town Car |
GO to Pinpoint Test HH . | ||
| All others | GO to Pinpoint Test HE . | ||