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:
Symbols in the instrument panel
WARNING
If and
come on at the same time
and the brake level is below the MIN mark
in the reservoir or if a brake system-related
message is shown in the information display: DO NOT DRIVE. ...
Refrigerant
Volvo cares about the environment. The air
conditioning system in your car contains a
CFC-free refrigerant – R134a. This substance
will not deplete the ozone layer. The air conditioning
system ...
Family-friendly features
One of the areas where the XC60 really shines is in its simple Scandinavian
interior. The designers tried to replicate the sensation of peace and
tranquility they experience on the Swedish coastli ...
