Standard Motor Products FLS309 Engine Coolant Level Sensor

The Standard Motor Products FLS309 is a direct-fit OE replacement engine coolant level sensor engineered to restore proper coolant monitoring to your vehicle's cooling system. This sensor communicates with the powertrain control module (PCM), providing a critical analog input signal that helps the PCM maintain closed-loop fuel mixture control.

The sensor operates on a reference voltage — typically 5 volts — supplied by the PCM when the engine is running. Its internal resistance is high when cold and decreases as the engine warms up, sending a varying voltage signal back to the PCM to accurately reflect engine temperature and coolant level status.

Key Features:

• Direct-fit OE replacement for proper fit, form, and function
• Copper alloy conductors for superior electrical conductivity and minimal resistive losses
• 100% tested to verify mechanical and electrical switching performance
• Provides accurate coolant level and temperature data to the PCM
• Supports closed-loop fuel mixture control alongside the oxygen sensor
• Manufactured to Standard Motor Products' strict quality control standards

Standard Motor Products is a leading aftermarket supplier of engine management components, offering a catalog of over 50,000 parts for domestic and imported vehicles. The FLS309 is built to the same standards as the original equipment sensor it replaces, ensuring reliable performance and a straightforward installation.