It is an error showing some issue with thermostat.
It means the engine isnt getting warm enough, replace the thermostat.
SOURCE: 2005 Mercury Monterey with check engine code
P0128 is Coolant Thermostat ( Coolant Temp Below Thermostat Regulating Temperature ). The thermostat may be stuck open, preventing normal operating Temperature from beeing reached.How is the heat inside the car is it below normal ? Or the engine Coolant Temperature Sensor may be faulty and needs to be replaced. Good Luck and have a good XMASS.
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