Q: Check Engine code P128

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I have Check Engine Code P0128. Autozone is telling me that it is my Coolant thermostat sensor. Others are telling me it could be the whole thermostat needing replaced. Is there any way to know which before ordering parts?

My car has 70000 miles.
My car has an automatic transmission.

the most common cause for this code is the thermostat replacement. The computer expects the engine to get to a temperature within a set amount of time and a stuck open thermostat will cause it not to reach operating temperature.

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