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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License plate lighting
1. Remove the screws with a screwdriver.
2. Carefully detach the entire bulb housing
and pull it out.
3. Replace the bulb.
4. Reinsert the entire bulb housing and
tighten the screws. ...
Introduction
Adaptive Cruise Control (ACC) is an optional
system designed to assist the driver by maintaining
a set speed or a set time interval to the
vehicle ahead. It is primarily intended for use
on lo ...
Activating DAC
Press MY CAR in the center instrument panel
and go to Car settings
Driver Alert and
select On. See page 133 for more information
on the menu system.
The function is activated when the
v ...
