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:
Center console buttons
Active Bending Lights
The beams of these headlights
adjust laterally to help light up a
curve according to movements
of the steering wheel when the
vehicle is turning. This function
is activ ...
Defroster
This function defrosts/de-ices
the windshield and front side windows. The indicator light in the defroster button
lights when the function is active.
Blower speed increases automatically and t ...
Setting a time interval
Controls and display
3 Time interval: Increase/decrease
6 Time interval: On, while it is being set
7 Time interval: On, after it has been set
Press to increase the interval
or to
decrease ...
