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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Overview of Bluetooth® controls
Center console control panel
1 VOLUME: the buttons on the steering
wheel keypad can be also be used.
2 Display
3 ENTER: press to answer an incoming call,
make menu selections or activate the
p ...
Minor scratches on the surface
If the stone chip has not penetrated down to
the metal and an undamaged layer of paint
remains, the touch-up paint can be applied as
soon as the spot has been cleaned. ...
Benefits of digital broadcasting
• Better sound (FM sounds near CD quality
and AM as analogue FM).
• Some FM frequencies offer a greater number
of listening choices through “multicasting”
(consisting of a frequency's main
ch ...
