NTK 21516 Oxygen Sensor

Overview of NTK Direct Fit Oxygen Sensor 21516

The NTK Direct Fit Oxygen Sensor 21516 is designed for precise emission control in select Buick, Cadillac, Chevrolet, GMC, Honda, Isuzu, Oldsmobile, and Pontiac vehicles. This heated oxygen sensor ensures accurate air-fuel mixture readings to support optimal engine performance and emissions compliance.

• Heated sensor type for faster response times
• Specific fit for multiple GM and other makes/models
• Threaded mounting with 18mm thread diameter
• Four-wire design for reliable signal transmission
• 15.75-inch wiring harness length for proper installation

Detailed Product Features and Specifications

The NTK 21516 oxygen sensor features a heated element that allows the sensor to reach operating temperature quickly, improving fuel efficiency and reducing emissions. Its specific fitment ensures compatibility with a range of vehicles including the Buick Century, Cadillac DeVille, Chevrolet Silverado 1500, GMC Sierra 2500, Honda Passport, and Pontiac Grand Prix among others. The sensor’s 18mm threaded mounting type provides a secure and direct fit installation, while the four-wire configuration supports both the sensor signal and heater circuit. The 15.75-inch wiring harness length is designed to accommodate factory routing without modification.

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 delivering sensors that fit directly into the original mounting locations without the need for adapters or splicing. The 21516 part number is part of this line, ensuring a straightforward installation process and reliable performance for emission control systems.

Common Applications and Issues Addressed

• Restores proper air-fuel ratio readings for improved engine efficiency
• Resolves check engine light triggers related to oxygen sensor faults
• Helps reduce harmful emissions by maintaining accurate sensor feedback
• Prevents rough idling and poor fuel economy caused by faulty sensors
• Supports compliance with emission regulations in compatible vehicles

Installation Notes and Tips

When installing the NTK 21516 oxygen sensor, ensure the vehicle is cool to avoid burns. Use a proper oxygen sensor socket to avoid damage to the sensor or wiring. Verify the wiring harness length and connector match the vehicle’s factory harness. It is recommended to apply anti-seize compound on the threads to facilitate future removal, but avoid contaminating the sensor tip. Follow vehicle-specific torque specifications to secure the sensor properly.

Quality Assurance and Warranty

NTK oxygen sensors undergo rigorous testing to meet OEM standards for durability and performance. The Direct Fit Oxygen Sensor 21516 is manufactured to provide consistent sensor output and long service life. Warranty coverage details should be confirmed with the supplier or manufacturer, as they may vary by region and application.