Genuine OEM Volkswagen Lambda Probe, part number 021906265N. This lambda probe, commonly referred to as an oxygen sensor, is an essential part of the engine management system. It measures the amount of unburned oxygen in the exhaust gases and sends this data to the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion and reduced emissions. The probe has a length of approximately 194mm. Genuine OEM lambda probes are calibrated for precise oxygen level detection, ensuring efficient fuel economy and compliance with emissions standards.