NTK 21556 Oxygen Sensor

Overview of NTK Direct Fit Oxygen Sensor 21556

The NTK Direct Fit Oxygen Sensor 21556 is engineered for precise emission control in select Buick, Cadillac, Chevrolet, GMC, Saab, and Saturn vehicles. Designed as a heated oxygen sensor with a specific fit, it ensures accurate air-fuel mixture readings for optimal engine performance.

• Heated oxygen sensor for faster response times
• Specific fit for select Buick, Cadillac, Chevrolet, GMC, Saab, and Saturn models
• Threaded mounting type with 18mm thread diameter
• Four-wire configuration for reliable signal transmission
• 20.5-inch wiring harness length for proper installation

Details on the Direct Fit Oxygen Sensor Product Line

The NTK Direct Fit Oxygen Sensor line is designed to provide exact replacement sensors that match OEM specifications. This product line focuses on delivering sensors with precise fitment and reliable performance, reducing installation time and ensuring compatibility with the vehicle’s emission system. The 21556 part number belongs to this line, offering a direct replacement solution for specific vehicle applications.

Product Features and Specifications

The NTK 21556 oxygen sensor features a heated sensor type, which allows it to reach operating temperature quickly, improving emission control efficiency. It has a threaded mounting type with an 18mm thread diameter, ensuring secure installation. The sensor includes four wires, supporting both the heater circuit and signal output. The wiring harness length is 20.5 inches, providing adequate length for proper routing and connection within the engine bay.

Compatible Vehicles and Applications

This oxygen sensor is compatible with a range of models from Buick, Cadillac, Chevrolet, GMC, Saab, and Saturn. Notable compatible models include the Buick LaCrosse and Enclave, Cadillac CTS and SRX, Chevrolet Equinox and Traverse, GMC Terrain and Acadia, Saab 9-4X, and Saturn Outlook and Vue. The specific fitment ensures that the sensor integrates seamlessly with the vehicle’s emission control system.

Common Issues Addressed by NTK Oxygen Sensor 21556

• 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 issues such as rough idling or hesitation
• Heater circuit failure causing delayed sensor response

Installation Notes and Tips

When installing the NTK 21556 oxygen sensor, ensure the engine is cool to avoid burns. Use an oxygen sensor socket or appropriate tool to remove the old sensor carefully. Verify the wiring harness length and connector compatibility before installation. Thread the sensor carefully to avoid cross-threading and torque to manufacturer specifications. It is recommended to check for any exhaust leaks after 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 21556 undergoes rigorous testing to ensure reliable operation under various driving conditions. Warranty coverage details should be confirmed with the distributor or retailer, as they may vary by region.