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:
Programming HomeLink
NOTE
Some vehicles may require the ignition
switch to be turned on or to the second
(“accessories”) position for programming
and/or operation of HomeLink. It is also recommended
that a new batter ...
Unique functions—PCC*
1 - Information button 2 - Indicator lights
Pressing the information button provides certain information about the vehicle
with the help of the indicator lights. ...
How HD broadcasting works
HD Radio works similarly to conventional radio and broadcasts of this type are
available in many areas of the United States. However, there are a few key differences:
Instead of transmitting one ...
