Genuine OEM Volkswagen Lambda Probe, part number 04E906262FR. This oxygen sensor, also known as a lambda probe, is installed in the exhaust system to measure the amount of oxygen in the exhaust gases. This data is critical for the engine control unit (ECU) to optimize the air-fuel mixture, ensuring efficient combustion, reducing emissions, and improving fuel economy. Genuine OEM lambda probes provide accurate readings and reliable performance, essential for emissions compliance and engine health.