Ford Fiesta Universal Water Temperature Sensor XS6F-12A648-BA, accurately matches engine

When Ford Fiesta shows starting difficulties, rough idle, abnormal idle speed fluctuations after cold start, or the water temperature gauge stays low and cooling fan cycles aggressively, the original water temperature sensor may be aged and failing to accurately transmit coolant temperature. This sensor normally monitors engine coolant temperature in real time and feeds data to the ECU to accurately control injection quantity, ignition timing, and fan on/off to keep engine in optimal operating condition. OEM number XS6F-12A648-BA, precisely matching Ford Fiesta entire range. Installation should be performed with the engine cold; first drain some coolant, remove the old sensor, clean the installation hole, replace the sealing gasket, and tighten to 15–20 N·m to avoid thread damage.