The O2 sensor fixture contains a miniature catalytic converter designed to work with your vehicle's emission system. If the main catalytic converter is damaged, this device may help reduce exhaust emissions and prevent the check engine light from illuminating due to catalyst efficiency issues. Avoid using unreliable extensions, as they often fail to provide consistent results. This unit features a built-in mini catalytic converter for improved performance. When the primary catalytic converter is removed, the downstream O2 sensor may detect increased temperature and unburned fuel, triggering a check engine light (CEL) with diagnostic trouble codes such as P0420 or P0430, indicating low catalyst efficiency. In some cases, these alerts may also stem from O2 sensor malfunctions. This CEL eliminator (commonly referred to as a mini cat) can assist in addressing certain P0420-related fault codes associated with catalytic converter efficiency. Features: 1. Precision-machined threads for accurate fitment and repeatability. 2. Durable construction with high-quality materials resistant to deformation and corrosion. 3. Universal design fits most vehicles with M18 x 1.5 threaded oxygen sensors. 4. Made from strong, long-lasting metal material. 5. Simple installation with direct mounting capability. Condition: New Type: O2 Sensor Spacer Thread: M18 x 1.5 Size: Approximately 1.85 x 0.98 x 1.18 inches Material: Metal Color: Silver Package Contents: 10 x Oxygen Sensor Spacers Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting conditions and monitor settings may cause slight variations in color appearance. Measurement tolerances are within +/- 1-3 cm.