See also:

Headlight aim (vehicles with low beam halogen bulbs)
 - Vertical movement adjustment bolts 1. Adjustment bolt A 2. Adjustment bolt B  - Before checking the headlight aim Make sure the vehicle has a full tank of gas and the area around ...

If you have questions
If you have questions or concerns about your vehicle’s federal emission warranty coverage, please follow the steps described on pages 9–10. In the case of the Emission Performance Warranty, y ...

Emissioinspectioand maintenance (I/M) programs
Some states have vehicle emission inspection programs which include OBD (On Board Diagnostics) checks. The OBD system monitors the operation of the emission control system. - If the malfunction i ...