How do states use OBD II for emission inspections?

Many states connect a computer directly to a vehicle's OBD II system. The inspector can then read "faults." In some states, this type of inspection has replaced the tailpipe emission test.
See also:
Using voice commands
The driver initiates a voice command dialogue by pressing the voice control button
(see the illustration on page 240).
When a dialogue has been initiated, commonly used commands will be shown in th ...
Volvo's recommendations
Why does Volvo believe that no child should sit in the front seat of a car? It's
quite simple really. A front airbag is a very powerful device designed, by law,
to help protect an adult.
Beca ...
Design Concept
The Volvo S40 is a tribute to Volvo's talented and multi-cultural design
teams in Gothenburg, Barcelona and California, who have captured the premium
values of a contemporary Volvo saloon in a com ...
