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Hello. It sounds like you have either unplugged or damaged the wiring to the engine coolant temperature sensor. Check it out very good. Make sure the connector is secure and the wiring is in good shape. It's item 5 in the attached image.
ENGINE COMPONENT 5
Hopefully that solves the issue. If you have any other questions please feel free to ask. Also, please remember to rate. Follow ups are always free. Thank you