Feature: 1. 45° O2 sensor adapter, prevent CEL from lighting up when installing a high‑flow catalytic converter. 2. With a common thread size of M18 x 1.5, suitable for most oxygen sensor, wide applications. 3. Premium iron material, with electrogalvanizing treatment, anti‑rust, rugged and durable. 4. Simple and fast installation, does not require complicated operations, convenient to use. 5. Manufactured to meet standard specification, strictly follow factory quality control. Specification: Item Type: 45 Degree Oxygen Sensor Adapter Material: Iron 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 way, which makes the vehicle's ECU think that the original catalytic converter is still in place.. Package List: 2 x Oxygen Sensor Adapter1 x Nut1 x Cover1 x Inner Core