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.
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Rearview mirror
To reduce glare from the headlights of following
vehicles, use the control to switch between
the normal and night-driving positions.
A Normal position
B Night position, reduces glare from follow ...
Cleaning the interior
Only use cleaning agents and car care products
recommended by Volvo. Clean regularly
and follow the instructions included with the
car care product. ...
Searching for and storing songs
The Song Seek function provides notification
when Sirius is broadcasting the songs selected
in song memory. Song memory enables you
to store the name of the song for future
advance notificatio ...
