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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2090 (Engine Controls - Powertrain DTC Charts And Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0128 - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

Description:  Indicates that 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
  • Inoperative engine coolant temperature (ECT) sensor
  • Inoperative cylinder head temperature (CHT) sensor
Diagnostic Aids:  Refer toTHERMOSTAT MONITOR for system information.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Vehicles with only a CHT sensor   - - refer to PINPOINT TEST DL .
All others   - - refer to PINPOINT TEST DX .
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