Don't take a chance 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 get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. As a result this will throw check engine lights (Cel, SES, DTC) typically the error codes will be P0420 (Catalyst System Efficiency Below Threshold Bank 1) and/or P0430 P0420 - Catalyst System Efficiency Below Threshold Bank ). CEL Fix Check Engine Light Eliminator Adapter- O2 Sensor for auto. 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: 3 * O2 Sensor Adapter Extender 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.