t take a on using an extension only as often they do not work, this is a real mini Catalytic Converter built into it. This O2 cel fix actually has a miniature catalytic converter built inside and will help rid of that annoying check engine light you after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. As a this will throw check engine lights (Cel, , ) typically the error codes will be P0420 (Catalyst System Efficiency Bank 1) and or or P0430 P0420 - Catalyst System Efficiency Bank ). CEL Fix Check Engine Light Eliminator Adapter- O2 Sensor for auto. Brand New and High Quality. Type:O2 Oxygen Sensor Adapter Surface treatment: electronickelling Thread: M18x1.5 Length: 58mm Function: check engine light fix Colour: silver Material: metal Size: 58x16x25mm Package Contents: 1 x O2 Sensor Adapter Extender Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.