NTK 21058 Oxygen Sensor - Downstream

Overview of NTK Direct Fit Oxygen Sensor 21058

The NTK Direct Fit Oxygen Sensor 21058 is designed for precise emission control in select GM and related vehicles. This heated oxygen sensor features a specific fitment for models like the Chevrolet Colorado and GMC Canyon, ensuring accurate sensor performance and reliable operation.

• Heated oxygen sensor for faster warm-up and improved efficiency
• Specific fitment for Buick, Chevrolet, GMC, Hummer, Isuzu, and Saab vehicles
• Threaded mounting type with an 18mm thread diameter for secure installation
• Four-wire design for enhanced signal accuracy and durability
• 15-inch wiring harness length for optimal routing and connection

About the NTK Direct Fit Oxygen Sensor Line

The Direct Fit Oxygen Sensor line by NTK is engineered to provide exact replacement sensors that match OEM specifications. This product line focuses on direct compatibility with specific vehicle makes and models, reducing installation time and ensuring proper sensor function. The 21058 sensor is part of this line, offering a heated sensor design that supports efficient emission control systems in various GM and related vehicles.

Product Details and Specifications

The NTK 21058 oxygen sensor is a heated sensor type, which means it includes an internal heating element to bring the sensor up to operating temperature quickly. This feature helps the engine control unit (ECU) receive accurate oxygen level readings sooner after startup. The sensor has a threaded mounting type with an 18mm diameter thread, allowing it to be securely installed in the exhaust system. It includes four wires, which typically correspond to the heater circuit and sensor signal, and a 15-inch wiring harness length to accommodate proper routing within the engine bay.

Compatible Vehicles and Fitment

This oxygen sensor is specifically designed for use with the following makes and models:

• Buick Rainier
• Chevrolet Colorado, Trailblazer
• GMC Canyon, Envoy
• Hummer H3, H3T
• Isuzu i-290, i-370
• Saab 9-7x
• Ascender (all applicable models)

Using the NTK 21058 sensor ensures proper fit and function in these vehicles, supporting emission control compliance and engine performance.

Common Issues Addressed by the NTK 21058 Oxygen Sensor

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture data
• Increased emissions from malfunctioning sensor signals
• Engine performance problems such as rough idling or hesitation
• Failed emissions tests related to sensor malfunction

Installation Notes and Tips

When installing the NTK 21058 oxygen sensor, ensure the vehicle is cool to avoid burns. Use an oxygen sensor socket or appropriate tool to remove the old sensor carefully. Verify the thread size (18mm) matches the exhaust port. Route the 15-inch wiring harness away from hot exhaust components and moving parts to prevent damage. Confirm electrical connections are secure and free of corrosion before completing installation.

Quality Assurance and Warranty

NTK oxygen sensors are manufactured to meet or exceed OEM standards for durability and performance. The Direct Fit Oxygen Sensor 21058 undergoes rigorous testing to ensure reliable operation in specified vehicle applications. While specific warranty details are not provided here, NTK typically offers coverage against defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.