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1999 Toyota Corolla 2.0L with code P0128

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1999 Toyota Corolla 2.0L with code P0128 but car is running fine. What is the problem?

Vehicle: 1999 Toyota Corolla 2.0L

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At some point, the thermostat got stuck, but it's probably OK now. I recommend replacing the thermostat, it may get stuck again and overheat the engine.

P0128 TOYOTA - Coolant Thermostat
Read more: https://www.autocodes.com/p0128_toyota.html

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