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I have a 2011 Ford Ranger 4.0L with engine code P0128, what is the repair?

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I have a 2011 Ford Ranger 4.0L with engine code P0128, what is the repair?

Vehicle: 2011 Ford Ranger 4.0L

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Best answer
Replace the thermostat it is most likely stuck stuck open if the car did not overheat or it is stuck closed if the car overheated.
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P0128 FORD - Coolant Thermostat
Read more: https://www.autocodes.com/p0128_ford.html

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