Calibration structure for flex fuel sensor

A calibration structure for calibrating a flex fuel sensor for a vehicle, the flex fuel sensor having a first sensor electrode and a second sensor electrode, the calibration structure comprising:

• a first electrically conductive member,
• a second electrically conductive member spaced from and electrically insulated from the first electrically conductive member, and
• means for providing capacitance, or resistance, or a combination of a capacitance and resistance, of a certain value through the first and second electrically conductive members,
• wherein the first and second electrically conductive members are separated from the first and second sensor electrodes and wherein the first electrically conductive member is constructed and arranged to be moved into contact with the first sensor electrode and the second electrically conductive member is constructed and arranged to be moved into contact with the second sensor electrode to provide a known input value to the flex fuel sensor for calibration of the flex fuel sensor without the use of test liquids.