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ant5110

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Question Asked: Troubleshooting help with a coolant thermostat problem. P0128 code.
July 28, 2014, 08:32 PM
The check engine light used to go off and on periodically. A month ago it came on and has not gone off. the code reads P0128, a coolant thermostat problem present. However, the engine temp gauge on my dash has been working perfectly normal this whole time. I am guessing it is a faulty sensor since, like I said, the check engine light used to go on and off periodically. What troubleshooting things can I do to find the solution?
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