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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1656 (Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> DTC P0406: Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High

DTC P0406: Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2010 Mercury Mountaineer, 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, and 2010 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: 
  • Differential pressure feedback EGR circuit open
  • VREF circuit short to voltage
  • Damaged differential pressure feedback EGR sensor
  • Differential pressure feedback EGR circuit short to voltage
  • SIG RTN circuit open
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 .
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