Features 1、Prevents CEL from illuminating when installing a high‑flow catalytic converter. 2、With a common size of M18 x 1.5, suitable for most oxygen sensor, wide applications. 3、Made of high grade iron material, high hardness, anti‑corrosion and durable. 4、Simple and fast installation, does not require complicated operations, convenient to use. 5、Built according to the original production specifications, in line with strict quality standards. Specifications: Item Type: 90 Degree Oxygen Sensor Adapter Material: Iron Application: Universal Description: When installing a high-flow catalytic converter in your car, your check engine light may come on due to increased airflow. The oxygen sensor adapter separates the rear oxygen sensor from the exhaust gas path, which makes the vehicle's ECU think that the original catalytic converter is still in place. Package List 2 x Nut 2 x Oxygen Sensor Extender 2 x Adapter