Check engine light comes on. diagnostic test says thermostat sensor, where is this located and how hard is it to change&
Never heard of a thermostat sensor. There is a diagnostic code that wil lbe set if the engine computer observes that the thermostat is not allowing the engine to reach operating temperature quickly enough. This code is based on information sent by the engine coolant temperature sensor. 99.9% of the time a new thermostat solves the problem. Use an AC Delco thermostat.
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Corrosion in the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
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A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
Circuit/System Verification
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