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Q: P0118 coolant temp code on 2000 Mazda 626

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Hi everyone! Can you tell me what this code means, where the sensor is located, and how it affects the running of the engine? I would appreciate any feedback I get.
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in most cases, this code is from a thermostat stuck open. the engine never heats up to the proper operating temp. i would check the temp when hot before replacing anything.

Roy
Thank you Roy...we will check the temp as you suggested. I appreciate your feedback!
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