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In the 2006 Ford F-150 5.4, the coolant temperature sensor can be found in the coolant flange situated to the left of the cylinder head. This sensor, also known as an ECT sensor or ECTS (engine CTS), is essential for measuring the temperature of the coolant/antifreeze mix in the cooling system. It helps determine the engine's heat output. A malfunctioning CTS sensor can provide inaccurate data to the computer, leading to incorrect fuel and timing calculations. It's not unusual for the CTS sensor to malfunction, causing it to continuously relay a cold signal to the computer.
The engine coolant temperature sensor can be found in the coolant flange on the left side of the engine block, and it is built into the engine coolant temperature (ECT) sensor.