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What does the ECT gauge sending unit" do ?

I have a 1998 Honda Civic EX 4 door sedan.

I'm getting a P0118 ECT senor problem.
I replaced the ECT senor 2 years ago. Don't know if
the ECT gauge senor has anything to do with the problem.

Thanks

Vehicle: 1998 , Honda Civic EX 4 door sedan, 4 cylinder

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P0118 Engine coolant temperature sensor circuit

The coolant temperature sending unit  sends signal for the temperature guage, The temperature sensor control fuel mixture and cooling fan. P0118 is coolnat temperatue sensor signal high input, which is low temperature, connection  of the coolant temperature sometimes are connections or even the wire as they become brittle whenever it is P0118 this is usually a poor connection.

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