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Fitment bosch advanced ceramic technology affords best-in-class performance. The ceramic element in bosch planar type oxygen sensors is created by printing multiple layers of protectiveinsulating adhesive and conductive materials including platinum on several ceramic layers. These layers are pressed together and fired in a kiln and the resulting element is lightweight and incredibly hard and strong for best-in-class performance and maximum service life. Coated threads for easy installation. Sensor layer protects it from the corrosive effects of exhaustgases Air duct layer creates a void for reference air in the finished assembly.