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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2289 (Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

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 P0128: COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

Description:  Indicates the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
Possible Causes: 
  • Insufficient warm up time
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Damaged engine coolant temperature (ECT) sensor
  • Damaged cylinder head temperature (CHT) sensor
Diagnostic Aids:  Refer to THERMOSTAT MONITOR for system information.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Explorer 4.0L,
Explorer Sport Trac 4.0L,
Mountaineer 4.0L,
Mustang 4.0L,
Ranger 4.0L		 - - GO to PINPOINT TEST DX .
All others - - GO to PINPOINT TEST DL .
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