* Engine Coolant Temperature (ECT) Sensor: This sensor provides the engine control module (ECM) with information about the engine coolant temperature. This is crucial for fuel injection and ignition timing.
* Coolant Temperature Gauge Sensor: This sensor sends a signal to the instrument cluster to operate the coolant temperature gauge on the dashboard.
While they both measure coolant temperature, they serve different purposes and send signals to different parts of the vehicle. They are not interchangeable.
