NTK EF0077 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor Overview

The NTK Engine Coolant Temperature Sensor, part number EF0077, is a direct-fit technical sensor for select Subaru applications. It uses a square female connector with two blade terminals for a factory-style electrical connection.

Built under the NTK Engine Coolant Temperature Sensor line, EF0077 reflects NTK’s focus on OE-level sensor coverage and application-specific fitment. This part number EF0077 is listed for Subaru WRX, WRX STI, BRZ, Legacy, Outback, Forester, Crosstrek, Impreza, and XV Crosstrek applications.

Key Features

• Square connector shape for a factory-style interface
• Female connector with two blade terminals
• Engine coolant temperature sensor for thermal signal monitoring
• NTK technical sensor line with OE-focused coverage
• Part number EF0077 for application matching

Detailed Description

EF0077 is an NTK engine coolant temperature sensor engineered for Subaru cooling-system applications that require accurate coolant temperature input to the engine management system. The connector design uses a square female housing and two blade terminals, helping ensure proper electrical engagement during replacement. If you are sourcing an engine coolant temperature sensor for Subaru WRX, Subaru WRX STI, or Subaru BRZ applications, EF0077 provides a fitment-specific option backed by NTK’s technical sensor expertise.

NTK positions this sensor line around OE experience, with testing that includes thermal shock, vibration, and OBD verification. That approach supports consistent sensor performance in demanding operating conditions and helps maintain proper temperature signal reporting for the vehicle’s control systems. This part cross-references Standard Ignition TX238 and other listed interchange numbers for the same application.

What This Part Helps Address

• Incorrect coolant temperature readings
• Illuminated engine warning lights related to sensor input
• Poor fuel control caused by inaccurate temperature data
• Hard starting or rough running when coolant signal is unstable
• Cooling-system monitoring faults in Subaru WRX and Subaru Outback applications

Installation Notes and Tips

Verify connector shape, terminal style, and application before installation. Confirm the vehicle’s build date for the 2017 Subaru Outback, since the fitment note specifies coverage from 6/2017. Inspect the harness connector for corrosion or damage before connecting the new sensor.

Quality Assurance

NTK states that its technical sensors are manufactured to meet or exceed OE specifications and are validated through thermal shock, vibration, and OBD testing. The brand also notes its role as an OE supplier with broad aftermarket sensor coverage.