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:
Main view
Example of RADIO mode's main view
1 - Modes (e.g., RADIO, MEDIA etc.), see the following table.
2 - Source menu, e.g., (FM1, DISC, etc.).
Press and hold EXIT on the steering wheel keypad to d ...
Unleaded fuel
Each Volvo has a three-way catalytic converter
and must use only unleaded gasoline. U.S. and
Canadian regulations require that pumps delivering
unleaded gasoline be labeled "UNLEADED". ...
Temporary Spare
A spare tire can be purchased for your vehicle as an accessory. Follow the instructions
included with the spare tire regarding use and stowing in the vehicle. See also
page 290 for additional info ...
