1. This O2 sensor adapter is designed to help prevent engine check lights from appearing after exhaust modifications, including replacement or removal of the catalytic converter, or when installing a high-flow catalytic converter. 2. It features a built-in mini catalyst that helps simulate the presence of a stock catalytic converter to maintain proper sensor readings. 3. The device works with the rear oxygen sensor by stabilizing signal output, helping to avoid error codes related to catalyst efficiency, such as P0420 or P0430, under certain conditions. 4. Intended for off-road use only. Specification: Product name: Car Oxygen O2 Sensor Adapter Product size: As shown Product color: As shown Product material: Metal Thread specification: M18 x 1.5 Packing list: Adapter * 1 Package weight: 40g Note: All images are professionally graded. However, due to differences in lighting and display settings, there may be slight variations between the image and the actual item. Measurements are taken manually and may have minor deviations, which do not affect functionality.