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:
Manual operation
1. Opening the sun shade: Pull the control
back to the first stop (the manual open
position) and hold it until the sun shade has
opened to the position of your choice.
2. Opening the rear edge ...
Symbols and messages in the display
...
Exterior
Partly because it was designed specifically as a sedan, the S80 looks
dramatically different than its squared-off predecessors. The compact grille
extends forward and is accented by a prominent V ...
