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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Cargo compartment light
1. Carefully insert a screwdriver and pry out
the lens.
2. Pry out the bulb and replace it.
3. Press the lens back into place. ...
Fuel filler cap
The fuel filler door, located on the right rear
quarter panel, is connected to your vehicle's
central locking system. ...
Main CD/DVD Data menu
Disc menu
Play/Pause
Stop
Random
Repeat folder
Change subtitles
Change audio track
Scan
Audio settings ...
