Check Engine Light fix is basically a way to space out the O2 sensor so that it still reads SOME exhaust gasses but it removes the O2 sensor from the direct flow of the gasses as to make the ECU believe there is a restriction in the exhaust gasses such as by a Catalytic Converter.100% Brand New and High QualityCEL Fix Check Engine Light Eliminator Adapter- O2 SensorSimply threads into the existing bungType:O2 Oxygen Sensor AdapterSurface treatment: electronickellingThread: M18*1.5Length: 45mm/1.77 inchFunction: check engine light fixMaterial:ironcolour:silverPackage Contents:1 x O2 Oxygen Sensor Extender SpacerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.