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:
Anti-lock brakes (ABS)
If the ABS warning lamp lights up there is a
malfunction in the ABS system (the standard
braking system will however function) and the
vehicle should be driven cautiously to a trained
and qualifie ...
Exterior
I love retro design as much as the next person, but I tend to appreciate it
more in inexpensive things like sneakers, T-shirts or coffee tables that I can
get rid of when my taste changes. But $49 ...
Driving distance on current fuel reserve
This function shows the approximate distance
that can be driven on the fuel remaining in the
tank. The calculation is based on average fuel
consumption during the last 20 miles (30 km)
of driv ...
