Genuine OEM Audi Lambda Oxygen Sensor, part number 4L0906262D. This sensor plays a critical role in engine management by monitoring the oxygen content in the exhaust gases, allowing the engine control unit to fine-tune the air-fuel mixture. It is an integral component of the vehicle's emission control system. Weighing approximately 0.186 kg, this sensor is designed for precise operation. Opting for a genuine OEM sensor ensures accurate readings and reliable performance, which is essential for maintaining optimal engine efficiency and compliance with emission regulations.