Do not risk using an extension that may not workthis is a real mini catalytic converter built into the unit. This O2 sensor fix contains a miniature catalytic converter inside and helps resolve the check engine light commonly triggered after exhaust modifications or removal of the catalytic converter, and sometimes even when installing a high-flow catalytic converter. This can trigger check engine lights with error codes such as P0420 (Catalyst System Efficiency Below Threshold Bank 1) and/or P0430.CEL Fix Check Engine Light Eliminator Adapter O2 Sensor for automotive use. . Type: O2 Oxygen Sensor Adapter Surface Treatment: Electro-nickel Plating Thread: M18x1.5 Length: 58mm Function: Check engine light correction Color: Silver Material: Metal Size: 58 x 16 x 25mm Package Contents: 1 x O2 Sensor Adapter Extender Note: The color may vary slightly due to lighting and screen display differences. Measurement allows an error of +/- 1-3cm.