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:
Scan
This function plays the first ten seconds of
each track/audio file. To start scanning:
1. Press OK/MENU.
2. Turn TUNE to Scan.
> The first ten seconds of each track/
audio file will be playe ...
Limitations
• Main channel vs. sub-channels (FM
only): The main channel is the only channel
that can receive in hybrid mode (both digital
and analogue). If a frequency has subchannels,
they are broadcast ...
Locking
1. Switch off the engine (see page 114 for
details).
2. Remove the remote key from the ignition
slot.
3. Open the driver's door.
> A sound will be audible when the steering
wheel lock enga ...
