Standard Ignition TX339 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor for Subaru Applications

Standard Ignition TX339 is an engine coolant temperature sensor built for direct replacement in select Subaru cooling system applications. It uses a screw-on attachment method and a 12-volt electrical design with a female connector, round and square connector shapes, and two male blade terminals for a secure connection.

Compatible With 2017-2023 Subaru Impreza, 2019-2023 Subaru Ascent, 2020-2022 Subaru Legacy, and 2020-2022 Subaru Outback. This TX339 coolant temperature sensor supports accurate engine temperature signal input for vehicles that rely on consistent coolant data for drivability and engine management.

Key Features

• Engine coolant temperature sensor for Subaru cooling system service
• Screw-on attachment method for direct-fit replacement
• Female connector with one connector interface
• Round and square connector shape with plug/socket type
• Two male blade terminals for electrical connection
• Brass and plastic construction with gold and white finish
• 12-volt electrical specification
• Standard Ignition TX339 part number for catalog matching

Detailed Description

Standard Ignition TX339 is an engine coolant temperature sensor used to report coolant temperature to the vehicle control system. In Subaru Impreza, Ascent, Legacy, and Outback applications, this sensor helps maintain accurate temperature feedback so the engine management system can respond properly to changing operating conditions. The brass and plastic construction, screw-on mounting style, and two-terminal blade design support a straightforward replacement where the original sensor uses the same configuration. This part cross-references Global Parts Distributors LLC 1814557 for the same application.

Searches for Subaru Impreza coolant temperature sensor, Subaru Ascent engine coolant temperature sensor, and Subaru Outback temperature sender often lead to this application. The TX339 part number is also a useful reference when matching the correct replacement sensor for 2017-2023 Subaru Impreza, 2019-2023 Subaru Ascent, 2020-2022 Subaru Legacy, and 2020-2022 Subaru Outback.

Common Issues This Sensor Can Address

• Incorrect coolant temperature readings on the dash or scan tool
• Hard starting or rough running related to temperature signal errors
• Cooling fan operation that does not follow engine temperature correctly
• Check engine light conditions tied to coolant temperature sensor faults
• Fuel mixture and drivability problems caused by inaccurate coolant data

Installation Notes and Tips

Verify connector style, terminal layout, and thread style against the original sensor before installation. Clean the mounting area and inspect the harness connector for corrosion, bent terminals, or damaged locking features. Because this is a screw-on sensor, proper thread engagement and sealing at the original mounting point are important for reliable operation. Confirm the vehicle application by year, make, and model before ordering TX339.

Quality Assurance

Standard Ignition is a recognized aftermarket brand for electrical and engine management components. TX339 is cataloged for direct replacement use in the listed Subaru applications and is built to match the specified connector and terminal configuration.