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:
Keylock
When you switch off the ignition, the gear
selector must be in the P (Park) position before
the key can be removed from the ignition
switch. ...
Buttons on the remote
Lock – Press
the Lock button on the
remote once to lock all doors and the tailgate.
The turn signals will flash once to confirm locking.
Unlock –
Press the Unlock button on the
remote once ...
Putting ACC in standby mode
Before ACC can be used to regulate speed and/or the distance to a vehicle ahead,
it must first be put in standby mode.
To do so:
Press .
The symbol appears in the display
and parentheses (---) ...
