Genuine OEM Audi Lambda Probe, part number 4L0906262L. This sensor is responsible for detecting the oxygen content in the exhaust gases before they enter the catalytic converter, providing vital data for the engine's fuel management system. It is specifically positioned on the front left side of the exhaust system, upstream of the catalytic converter. Weighing approximately 0.223 kg, this component is built to exacting factory standards. Using a genuine OEM lambda probe ensures precise signal output and correct integration with the vehicle's ECU, which is essential for accurate emission readings and optimal engine performance.