Fangrui Product Details Fangrui Product Details Fangrui Product Details 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 Even If The High-flow Catalytic Converter Is Installed After Modifying The Exhaust Gas Or Removing The Catalytic Converter. Dont Risk Using Extensions Because They Usually Dont 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 * For Off Road It Takes A Long Time To Use. But Sometimes, Cel Alerts Are Cause