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 BMW 325i 1987-1988 Direct Fit Oxygen Sensor (Part Number 25540) is engineered to optimize your vehicle's engine performance and fuel efficiency. Designed specifically for models including the 1987 and 1988 BMW 325i and 325is, this sensor provides precise feedback to your vehicle’s engine control unit (ECU), ensuring the air-fuel mixture remains within optimal ranges. Proper functioning of this sensor helps reduce harmful emissions and supports your vehicle’s on-board diagnostics system in identifying fuel delivery or catalytic converter issues.
The NGK sensor features an advanced ceramic sensor element with a three-stage contaminant-resistant plasma jet and deposit trap overcoat, which protects against element poisoning and prolongs sensor life. Constructed with high-quality materials, it maintains performance even under harsh engine conditions, contributing to consistent engine operation and fuel economy.
Easy to install as a direct fit replacement, this oxygen sensor is designed to meet or exceed OEM specifications, ensuring reliable operation and compatibility with your vehicle. Trust NGK for superior OE application technology and durable sensor design that helps maintain your vehicle’s emissions standards and engine health over the long term.

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