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 Audi A4 2010-2009 Direct Fit Oxygen Sensor (Part Number 25729) is an essential component designed to optimize your vehicle's engine performance and fuel efficiency. Built by NGK, a trusted brand and the world's largest OEM oxygen sensor supplier, this sensor provides precise feedback to your vehicle’s onboard diagnostic system, enabling accurate air-fuel ratio control and emission management. Its advanced ceramic sensor element features a three-stage contaminant-resistant plasma jet and deposit trap overcoat, which protects against sensor poisoning and ensures long-lasting, reliable operation. This innovative design helps maintain catalytic converter efficiency and reduce harmful emissions, supporting your vehicle's compliance with environmental standards. The sensor's direct-fit design ensures straightforward installation, making it suitable for a range of Audi models including the S6, RS7, and S7 from 2007 to 2015. Manufactured with strict quality controls, this oxygen sensor is engineered to withstand harsh engine conditions and resist failure, delivering consistent performance over time. As part of NGK's commitment to OE application technology, this sensor is a perfect replacement for your vehicle’s original component, providing peace of mind and optimal engine operation. Whether you're performing routine maintenance or addressing specific emission issues, the NGK Audi A4 oxygen sensor offers a dependable solution to keep your vehicle running smoothly and efficiently.

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