Each vehicle is equipped with a decal (Figure 1) containing emission control information that applies specifically to that vehicle and engine. The specifications provided on the decal are critical to servicing emissions systems.

In addition to the tune-up specifications and procedures, the emission decal shows a color-coded schematic of the engine vacuum system. The color on the schematic represents the actual color of the vacuum hoses. However, there will be instances when a hose color will not match the color on the schematic.

The Emission Calibration Number Label (Figure 2) contains the engine calibration number. The label is located on the driver's side door or door post pillar.