Ford P0128 OBD-II Trouble Code Definition: P0128 Engine Coolant Temperature Below Thermostat Regulating Temperature P0128 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What does the code mean? OBD-ii Code P0128 definition: This means that the engine’s PCM detected that the engine has not reached the required temperature […]