Features: brand new and high quality Don'for t take a chance on using an extension only as often they do not work. 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. This O2 cel fix without miniature for cat will trick your ECU into thinking the stock is still installed. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel. 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 2). For OFF ROAD use only. Built-in M18X1.5 catalytic converter, helps to get rid of checking engine lights. Specifications: Material:Metal Size:Approx.16.9x46.5mm/0.67x1.83in Net Weight:35g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Oxygen O2 Sensor