Each vehicle is equipped with a decal (Figure 1) containing emission control data 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 coding on the schematic represents the actual color coding on the vacuum hoses. However, there will be instances where an individual hose color will not agree.

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