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 believe the original catalytic converter is still installed. When the catalytic converter is removed, the rear O2 sensor detects higher temperatures and increased unburned fuel flow. This will trigger an inspection engine light (CEL), commonly with error code P0420 (catalyst system efficiency below threshold, bank 1) and/or P0430 (catalyst system efficiency below threshold, bank 2). This device is intended for off-road use only and requires time to stabilize. However, CEL alerts can sometimes be caused by O2 sensor issues. For example, if the O2 sensor is overly sensitive, the CEL may remain on even after installing the device, potentially causing additional error codes. Therefore, this CEL canceller (also known as a mini converter) cannot resolve all CEL-related issues. It is designed to address only the P0420 code—faulty catalytic converter—which is the most common cause. 1. Threads are precision-machined with specialized tools for accurate fit and consistency. 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 bung openings. 4. Constructed from high-quality metal for strength and durability. 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: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.