The O2 cel fixture actually contains a miniature catalytic converter so if the real catalytic converter is damaged, the CEL eliminator can help you reduce toxic gases.that helps to get rid of the annoying inspection of the engine light. Don't risk using extensions because they usually don't work, this is a built-in real mini-catalytic converter. This O2 cel fixture with a miniature cat will make your ECU think the inventory catalytic converter is still installed. When you remove the catalytic converter, the rear O2 sensor will see higher temperatures and greater unburned fuel flow. Therefore, this will throw an inspection engine light (Cel, SES, DTC), usually with error code P0420 (catalyst system efficiency below threshold library 1) and / or P0430 P0420 - catalyst system efficiency below threshold library x for OFF ROAD It takes a long time to use. But sometimes, CEL alerts are caused by O2 sensor problems. It will 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, excellent material, not easy to deform or rust. 3. Universal accessories for most vehicles with M18 x 1.5 O2 sensor. 4. Made of high quality,high strength and durable. 5. Simple installation, direct fixing bolts Condition: new Type: O2 Sensor Thread: M18 x 1.5 Size:about 1.85 x 0.98 x 1.18 inche Material:metal colour:Silver Package Contents: 10 x Oxygen 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.