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P1288 - Cylinder Head Temperature (CHT) Sensor Out Of Self-Test Range

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P1288 - CYLINDER HEAD TEMPERATURE (CHT) SENSOR OUT OF SELF-TEST RANGE

Description:  Indicates the CHT sensor is out of self-test range. The engine is not at a normal operating temperature.
Possible Causes: 
  • Cold engine
  • Engine overheating
  • Damaged harness connector
  • Low engine coolant level
  • Damaged CHT sensor
Diagnostic Aids:  Bring the engine to operating temperature. If cold, repeat the self-test. If the engine overheats, check the cooling system.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST DL .
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