NTK 24539 Oxygen Sensor - Downstream or Upstream

Direct Fit Oxygen Sensor

NTK Oxygen Sensor 24539 is a specific-fit heated oxygen sensor for select Toyota applications. It is built with a 4-wire design, a 20-inch harness, an 18 mm thread diameter, and a flange mount for OE-style replacement.

Key Features

• Specific-fit oxygen sensor for direct replacement applications
• Heated sensor design for faster operating response
• 4-wire configuration with 20-inch wiring harness
• 18 mm thread diameter and flange mounting type
• NTK 24539 for select Toyota Pickup and Toyota MR2 applications

Detailed Description

NTK 24539 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific replacement parts with OE-style fit, form, and function. NTK uses ceramic engineering and manufacturing controls from raw material through finished sensor production, and each oxygen sensor is tested during manufacturing to meet or exceed OE specifications. This part cross-references Bosch 15711 and Delphi ES20036 for the same application.

Compatible With select Toyota applications, this oxygen sensor fits 1989-1991 Toyota Pickup, downstream, and 1988-1989 Toyota MR2, upstream. Use it when replacing a heated oxygen sensor on a Toyota Pickup or Toyota MR2 with the listed configuration and emissions setup. The NTK 24539 is built for direct-fit service where the original sensor uses the same mounting style and wiring layout.

What It Is Used For

• Replacing a worn or slow-responding oxygen sensor
• Restoring proper air-fuel ratio feedback to the engine control system
• Addressing sensor-related fault codes or emissions concerns
• Correcting drivability issues tied to inaccurate exhaust oxygen readings
• Servicing direct-fit Toyota oxygen sensor applications with the listed configuration

Installation Notes and Tips

Verify the vehicle year, model, position, and emissions notes before ordering. Confirm the 4-wire layout, 18 mm thread diameter, and flange mount match the original sensor. For the Toyota Pickup application, check the California emissions and short-bed notes; for the Toyota MR2 application, confirm the Bank 1 Sensor 1 upstream location.

Quality Assurance

NTK states that these oxygen sensors are extensively tested during manufacturing and are engineered to meet or exceed OE specifications. The brand is part of the NGK family and is recognized as a major original equipment oxygen sensor supplier.