This O2 sensor adapter features a built-in miniature catalytic converter designed to help address check engine light issues that may occur after exhaust modifications, catalytic converter removal, or installation of a high-flow catalytic converter. Common trouble codes it may help resolve include P0420 (Catalyst System Efficiency Below Threshold – Bank 1) and P0430 (Catalyst System Efficiency Below Threshold – Bank 2). CEL Fix Check Engine Light Eliminator Adapter – O2 Sensor for Automotive Use Type: O2 Oxygen Sensor Adapter Surface Treatment: Electrophoretic nickel plating Thread Size: M18x1.5 Length: 58 mm Function: Check engine light correction Color: Silver Material: Metal Dimensions: 58 x 16 x 25 mm Package Contents: 1 x O2 Sensor Adapter Extender Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 mm.