The O2 cel fiture actually contains a miniature catalytic converter so if the real catalytic converter is , the CEL eliminator can help you reduce gases.that helps to the annoying inspection of the engine light. Dont risk using etensions because they usually dont work, this is a built-in real mini-catalytic converter. This O2 cel fiture with a miniature cat make your ECU think the inventory catalytic converter is still installed. When you remove the catalytic converter, the rear O2 sensor see higher temperatures and greater unburned fuel flow. Therefore, this throw an inspection engine light (Cel, , ), usually with error code P0420 ( system efficiency below threshold library 1) and / or P0430 P0420 - system efficiency below threshold library for OFF ROAD It takes a long time to use. But sometimes, CEL alerts are caused by O2 sensor problems. It still cause more code errors! So our CEL canceller (someone called Mini cat) It can solve one of the P0420 codes - Fault Catalytic Converter (most common) 1. Threads are made with special tools for precision and repeatability. 2. Simple structure, ecellent material, not easy to deform or rust. 3. Universal accessories for most vehicles with 1.5 O2 sensor. 4. Made of ,high strength and . 5. Simple installation, direct fiing bolts Condition: Type: O2 Sensor Thread: 1.5 Size:about 1.85 0.98 1.18 inche Material:metal colour:Silver Package Contents: 10 Oygen Sensorapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.