The O2 sensor fixture contains a miniature catalytic converter designed to help reduce emissions if the main catalytic converter is damaged. This device helps prevent the check engine light from illuminating due to catalytic converter efficiency issues. Avoid using unreliable extensions, as they often fail to function properly. This unit features a built-in mini catalytic converter compatible withimproved performance. The O2 sensor fixture with a mini catalytic converter signals the ECU to recognize the presence of a functioning catalytic converter. When the catalytic converter is removed, the downstream O2 sensor may detect increased exhaust temperatures and higher levels of unburned fuel, which can trigger a check engine light (CEL, SES, DTC) with diagnostic trouble codes such as P0420 (catalyst system efficiency below threshold bank 1) and/or P0430. In some cases, check engine light alerts may be caused by O2 sensor malfunctions, leading to additional error codes. This CEL eliminator (commonly referred to as a mini cat) is designed to address certain P0420 codes related to catalytic converter efficiency. Features: 1. Precision-engineered threads compatible withaccurate fitment and repeatability. 2. Simple design with high-quality materials resistant to deformation and corrosion. 3. Universal fit compatible withmost vehicles with M18 x 1.5 O2 sensors. 4. Constructed from durable, high-strength metal. 5. Easy installation with direct mounting. Condition: New Type: O2 Sensor Adapter 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 Adapters Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display settings may cause slight variations in color representation. Measurement tolerance is +/- 1-3 cm.