Product details This O2 CEL fixture actually has a tiny catalytic converter built in, which will help in checking the engine after changing its exhaust or removing its catalytic converter, sometimes even when installing a high-flux catalytic converter light to get rid of this trouble. Don't take a chance just because it often doesn't work, this is a real tiny catalytic converter integrated into it. This small cat's O2 CEL fixation will make your ECU believe that the catalyst converter is not installed. When it removes the catalyst converter, the O2 sensor will see a rise in temperature and an increase in the flow of unburned fuel. Weight: 72G Wire: M181.5 Color: silver Material: Metal Package Contents: 1.*Oxygen sensor Oxygen Space Sensor Converter Fan Converter Catalytic Converter Fixed Pair Oxygen Sensor