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

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2014 Lincoln Navigator, 2014 Lincoln MKZ, 2014 Lincoln MKX, 2014 Lincoln MKT, and 2014 Lincoln MKS. 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:  This DTC sets when 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 
Edge 2.0L,
Escape 2.0L,
Explorer 2.0L,
Fiesta,
Focus,
Fusion 1.5L,
Fusion 1.6L,
Fusion 2.0L,
MKT 2.0L,
MKZ 2.0L,
Taurus 2.0L,
Transit Connect 1.6L		 GO to PINPOINT TEST DX: ENGINE COOLANT TEMPERATURE (ECT) SENSOR .
All others GO to PINPOINT TEST DL: CYLINDER HEAD TEMPERATURE (CHT) SENSOR .
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