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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1784 (Engine Controls - Powertrain DTC Charts And Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> P0406 - Exhaust Gas RECIRCULATION (EGR) Sensor A Circuit High

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 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
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 key ON, engine OFF or running indicates a hard fault.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Vehicles with an EGR system module (ESM) refer to PINPOINT TEST HH .
All others refer to PINPOINT TEST HE .
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