NTK is the world's largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle's on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. Providing constant closed loop feedback to the ECU, oxygen sensors help to control the air-fuel ratio while alerting OBDII systems of possible problems with fuel delivery or catalytic converter efficiency. A ceramics company at our core, NTK uses state-of-the art technology enabling control of the ceramic element used in our oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology. NTK is constantly improving sensor designs to provide excellent performance and improve resistance to failure. NTK works with their OEM manufacturers through each phase of development from concept to production.

ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning

The NGK Chevrolet Astro 1996-1997 Direct Fit Oxygen Sensor (Part Number 21539) is designed to ensure your vehicle maintains optimal engine performance and fuel efficiency. Manufactured by NGK, a trusted leader in automotive sensor technology, this oxygen sensor plays a vital role in your vehicle's on-board diagnostic system by providing real-time feedback to the engine control unit (ECU). This feedback helps regulate the air-fuel mixture, contributing to reduced emissions and improved catalytic converter efficiency. Crafted with advanced ceramic sensor elements, this sensor features a 3-stage contaminant-resistant plasma jet and deposit trap overcoat, which protects against element poisoning and extends service life. These design features make the sensor highly resistant to failure and capable of delivering consistent, reliable performance over time. Designed as a direct fit replacement, it ensures ease of installation and compatibility with your vehicle’s existing system, fitting models such as the 2000-2002 GMC Yukon and Chevrolet Tahoe. Built to meet OE standards, this sensor is critical for maintaining your vehicle’s emission compliance and overall engine health. Trust NGK, a brand renowned for precision and durability, to provide a high-quality component that helps keep your vehicle running smoothly. Whether you're addressing a check engine light or performing routine maintenance, this oxygen sensor offers the reliability and performance you need to keep your vehicle operating at its best. Ensure your vehicle’s emissions system functions effectively and enjoy optimal fuel economy with this premium oxygen sensor from NGK, designed specifically for select GM models from the late 1990s and early 2000s.

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