Car CEL Fix Check Engine Light Eliminator Oxygen O2 Sensor Protective Shell Plug Adapter M18 x 1.5 Feature: 1. Avoid using extensions that may not function properly. 2. This O2 sensor simulator is designed to maintain proper signal feedback to the ECU after removing the catalytic converter. Removing the converter may cause the downstream O2 sensor to detect changes in exhaust temperature and oxygen levels. 3. These changes may trigger check engine lights with diagnostic trouble codes such as P0420 or P0430, indicating catalyst efficiency issues. This device is intended for off-road use only and not for use on public highways or vehicles subject to emissions regulations. Specification: Material: Stainless steel Color: Silver Thread: M18 x 1.5 Length: 46.5mm / 1.83 inches Function: O2 sensor spacer adapter for off-road applications Note: Slight size variations may occur due to manual measurement methods. Actual product color may vary slightly due to lighting conditions and screen display differences. 1 x O2 Sensor Spacer Adapter