This O2 sensor adapter is designed for off-road use only and features a built-in mini catalyst to help prevent engine check lights after exhaust modifications. It works by simulating the signal of a functioning catalytic converter, helping to avoid error codes such as P0420 or P0430 related to catalyst system efficiency. The device installs between the rear oxygen sensor and exhaust system, providing compatibility with certain performance exhaust setups. Product Name: Car Oxygen O2 Sensor Adapter Product Size: As shown in images Product Color: As shown in images Product Material: Metal Thread Specification: M18 x 1.5 Packing List: 1 x Adapter Package Weight: 40g Note: Images are professionally edited. Due to variations in lighting and display settings, actual product color may vary slightly. Measurements are taken manually and may have slight deviations, but this does not affect functionality.