Calibration Number Identification: Notes

To identify the calibration number, find the engine code label, generally located at the front of the engine. Although there are several label styles, the engine calibration number is shown on each label. Calibration codes will begin with the digit indicating current model year. For example, calibrations currently listed for 1982 Ford Vacuum Diagrams all begin with "2".

Each vehicle is also equipped with a decal containing emission control data applying to that vehicle and its engine. These decals are usually located on the underside of the hood, the radiator support, zip tube, fan shroud or other visible engine compartment location.