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:
Switching BLIS on and off
BLIS is automatically activated when the ignition
is switched on. The indicator lights will
provide confirmation by flashing 3 times.
• The system can be switched off by pressing
the BLIS but ...
USB
USB connector in glove compartment
If you connect an iPod
, MP3 player or a USB
flash drive to the optional USB connector, this
device can be controlled using the vehicle's
audio controls ...
Main CD/DVD Data menu
Disc menu
Play/Pause
Stop
Random
Repeat folder
Change subtitles
Change audio track
Scan
Audio settings ...
