The flex fuel sensor measures the ethanol to petrol ratio of the fuel passing through the sensor orifice. This enables the vehicle  to be operated on a blend of E85 and Petrol with the ECU adjusting the fuel delivery and ignition timing based of ethanol content. This Flex Fuel sensor is a Genuine OEM Sensor made by GM Continental.  Comes with a matching connector plug and pins. * We now offer a Billet CNC Machinned bracket that will make it easy to mount in the car at additional cost *