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 ...
New Tires
Remember that tires are perishable goods. As of 2000, the manufacturing week
and year (Department of Transportation (DOT) stamp) will be indicated with 4 digits
(e.g., 1510 means that the tire i ...
Random
This function plays the audio files on the external
device in random order (shuffle). This function
can be activated/deactivated under:
Bluetooth menu
Random
Press the buttons on the cente ...
