Mondeo Mazda Universal Water Temperature Sensor LF01-18-840/L35G-18-840, Precise Temperature Control

Mondeo and Mazda series can use universal engine coolant temperature sensor LF01-18-840, directly replaces OEM numbers LF01-18-840, L35G-18-840 and XU3F-12A648-AA. Core function is real-time monitoring of coolant temperature to precisely control fan on/off and injector quantity. Replacements resolve improper water temperature readings, engine overheating, or cold-start difficulty. If the temperature gauge fluctuates or fans run erratically, sensor aging is indicated and replacement restores proper function.