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

Ensure optimal engine performance and emissions control with the NGK Audi A8 Quattro 2005-2009 Direct Fit Oxygen Sensor, Part Number 25661. Designed specifically for select Audi A8 Quattro models from 2005 to 2009, this sensor plays a vital role in maintaining the ideal air-fuel mixture through real-time feedback to the vehicle's ECU. Proper functioning of this sensor helps maximize fuel efficiency, reduce harmful emissions, and prevent potential engine issues. Crafted by NGK, a trusted leader in automotive sensors, it guarantees OE-quality fit and reliable performance. The sensor features an advanced ceramic element protected by a 3-stage contaminant-resistant plasma jet and deposit trap overcoat, providing superior resistance to poisoning and ensuring long-term durability. This design ensures the sensor maintains accuracy even in challenging environments, contributing to the vehicle's overall health and compliance with emission standards. Installation is straightforward with a direct fit for compatible models, making it a cost-effective solution for vehicle owners and professional technicians alike. The sensor complies with Prop 65 regulations and is not restricted from air freight, ensuring wide availability. Trust NGK, the sensor specialist, for innovative, high-quality automotive sensor solutions that support your vehicle's performance and longevity.

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