P0116 is-- engine coolant tempurature ckt/range performance----- p0 128 is--coolant temp below thermostat regulating temperature. to fix these 2 codes are similar, change coolant tempurature sensor and thermotat all should be ok. make sure coolant in radiater is full. hope this helps you.
A code P0128 may mean that one or more of the following has happened:
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