NTK 21558 Oxygen Sensor

Overview of NTK Direct Fit Oxygen Sensor 21558

The NTK Direct Fit Oxygen Sensor 21558 is designed for precise emission control in select GM and related vehicles. This heated oxygen sensor features a specific fitment for models such as the Chevrolet Equinox, Buick Lucerne, and GMC Envoy, ensuring reliable performance and compatibility.

• Heated oxygen sensor for faster response times
• Specific fit for select Buick, Cadillac, Chevrolet, GMC, Isuzu, Pontiac, Saab, and Saturn models
• Threaded mounting type with 18mm thread diameter
• 16.5-inch wiring harness length with 4 wires for secure connection
• Part number 21558 for accurate identification and replacement

Details on the Direct Fit Oxygen Sensor Line

The NTK Direct Fit Oxygen Sensor product line focuses on providing exact replacement sensors tailored to specific vehicle applications. This ensures that the sensor matches the original equipment specifications, including wiring, thread size, and mounting type. The 21558 sensor is part of this line, offering a direct fit solution that simplifies installation and maintains emission system integrity.

Product Features and Specifications

This oxygen sensor is a heated type, which helps the sensor reach operating temperature quickly for improved fuel management and emissions control. It has a threaded mounting type with an 18mm diameter, compatible with the exhaust system of the listed vehicles. The wiring harness length is 16.5 inches, featuring 4 wires to support the heated sensor function and signal transmission.

Compatible Vehicles and Applications

• Buick Lucerne, Rainier
• Cadillac DTS
• Chevrolet Equinox, Malibu, HHR, SSR, Trailblazer, Trailblazer EXT
• GMC Envoy, Envoy XL, Terrain
• Isuzu Ascender
• Pontiac G6, Solstice, G6
• Saab 9-7x
• Saturn Aura, Vue

Common Issues Addressed by Oxygen Sensor 21558

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased emissions and failed emissions tests
• Engine performance problems such as rough idling or hesitation
• Delayed sensor response affecting catalytic converter efficiency

Installation Notes and Tips

Ensure the vehicle is cool before beginning installation to avoid burns. Use the correct 18mm socket for removal and installation of the sensor. Verify the wiring harness length of 16.5 inches is sufficient for your vehicle’s routing. Confirm the 4-wire connector matches the original sensor to avoid electrical issues. Follow torque specifications recommended by the vehicle manufacturer to prevent damage.

Quality Assurance and Warranty

NTK oxygen sensors are manufactured to meet OEM standards for fit, form, and function. The Direct Fit Oxygen Sensor 21558 undergoes rigorous testing to ensure durability and accurate sensor output. While specific warranty details may vary, NTK typically offers coverage against defects in materials and workmanship to support long-term reliability.