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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CD/DVD functions
Center console control panel
1 Disc slot
2 MEDIA button
3 Eject
4 Number keys
5 TUNE:Turn to navigate among menu
selections/folders/tracks.
6 OK/MENU: Press to confirm your selection
or ac ...
Functions
1 A/C – ON/OFF
• The air conditioning functions only at temperatures
above 32°F (0°C).
• While the Defroster function is selected,
the air conditioning is temporarily activated
to dehumidify the ...
Pairing and connecting an external device
Before an external device can be connected, it
must be paired to the infotainment system. The
procedure for connecting an external device
varies, depending whether or not the device
has previo ...
