Do not risk using extensions as they typically do not function properly; this is a built-in real mini-catalytic converter. This O2 sensor fixture with a miniature component will make your ECU register that the original catalytic converter is still in place. When the catalytic converter is removed, the rear O2 sensor detects higher temperatures and increased unburned fuel flow. This triggers an inspection engine light (CEL), commonly associated with error code P0420 (catalyst system efficiency below threshold, bank 1) and/or P0430 (catalyst system efficiency below threshold, bank 2). For off-road use only. However, CEL alerts can also stem from O2 sensor issues. For instance, an overly sensitive O2 sensor may continue to trigger the CEL even after installation of the device, potentially causing additional error codes. Therefore, this CEL canceller (sometimes referred to as a Mini) cannot resolve all CEL-related issues. It is designed to address only the P0420 code related to catalytic converter efficiency (the most common issue). 1. Threads are precision-made using specialized tools for accurate fitment. 2. Simple design with high-quality materials, resistant to deformation and rust. 3. Universal fit for most vehicles with 18mm x 1.5 O2 sensor threads. 4. Constructed from durable, high-strength metal. 5. Easy installation with direct bolt-on design; no modifications required. Condition: New Type: O2 Sensor Gasket Adapter Thread: 18mm x 1.5 Material: Metal Color: Silver Package Contents: 2 x Oxygen Sensor Adapters Note: The package includes only the items listed above. Other accessories are not included. Lighting and display differences may cause slight color variations between the product image and actual item. Measurement tolerance is +/- 1-3 cm.