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

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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
Fiesta, Focus	GO to PINPOINT TEST DX .
All others	GO to PINPOINT TEST DL .