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:
Ignition modes and electrical current to RSE
RSE can be activated with the ignition in
modes I or II (and when the engine is running).
See page 82 for detailed information about the
various ignition modes. If a film is being played,
it wi ...
Automatic re-arming
If the doors are unlocked, the locks will automatically
reengage (re-lock) and the alarm will
re-arm after 2 minutes unless a door or the tailgate
has been opened. ...
FAV—storing a shortcut
The FAV button can be used to store frequently used functions, making it possible
to start the stored function by simply pressing FAV. One favorite (for example,
Equalizer) can be programmed for ...
