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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P0127: Intake Air Temperature (IAT) Too High

DTC P0127: Intake Air Temperature (IAT) Too High

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0127 - INTAKE AIR TEMPERATURE (IAT) TOO HIGH

Description:  Indicates that the IAT2 sensor has detected a potential abnormality in the intercooler system. This condition will cause the boost from the supercharger to be bypassed to avoid potential engine damage.
Possible Causes: 
  • Blockage of heat exchangers
  • Low fluid level
  • Fluid leakage
  • Intercooler pump or relay failure
  • Crossed intercooler coolant lines
Diagnostic Aids:  Monitor the IAT2 PID. A typical IAT2 temperature should be greater than the IAT1 temperature. Refer to REFERENCE VALUES - GASOLINE MODELS for ranges.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to DU: Intake Air Temperature 2 (IAT2) Sensor STEP DU7.
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