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:
Changing the set speed
After a speed has been set, it can be increased or decreased by using the
or
buttons. Each time one of these buttons
is pressed, the vehicle's speed changes by 5 mph (approximately 8 km/h).
...
Tailgate wiper/washer
A section of the switch
O Neutral position: The wiper is switched
off
B Normal (continuous) wiping: Press the
lower section of the switch
Move the lever forward to start the tailgate
washer. A ...
Safety
Safety features include antilock brakes, side-impact and side curtain-type
airbags, and whiplash protection. ...
