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 design 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 triggers an inspection engine light (CEL), commonly accompanied by error codes 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 integrate. However, CEL alerts can sometimes result from O2 sensor issues. For example, an overly sensitive O2 sensor may continue to trigger the CEL even after installation of the canceller, potentially causing additional error codes. Therefore, this CEL canceller (also known as a mini simulator) cannot resolve all CEL-related issues. It is designed specifically to address the P0420 code—faulty catalytic converter—which is the most common cause. 1. Threads are precision-machined with specialized tools for accurate fitment and consistency. 2. Simple construction, made from high-quality materials, resistant to deformation and rust. 3. Universal fit for most vehicles with 18mm x 1.5 O2 sensor bungs. 4. Constructed from high-strength, durable metal material. 5. Easy installation with direct bolt-on design; no modifications required. Condition: New Type: O2 Sensor Spacer Adapter Thread: 18mm x 1.5 Material: Metal Color: Silver Package Contents: 2 x Oxygen Sensor Adapters Note: Light reflection and display differences may cause slight variations between the product color in images and the actual item. Measurement may vary by +/- 1-3 cm.