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:
BRAKE Brake circuit malfunction
The brake system is a hydraulic system consisting
of two master cylinders and two separate
brake circuits. If a problem should occur in
one of these circuits, it is still possible to stop
the vehi ...
Resume set speed
If cruise control has been deactivated temporarily,
it can be reactivated by pressing .
The
vehicle's speed returns to the most recently set
speed.
WARNING
There may be a significant increas ...
