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:
Range
The PCC's lock and unlock functions have a range of approximately 60 ft. (20
m) from the vehicle.
NOTE
The approach lighting, panic alarm, and the functions controlled by the
inform ...
Rear seats
The seat belt reminder in the rear seat has two additional functions:
It provides information about which seat belts are fastened in the rear
seat. A message will appear in the information disp ...
Interior
According to Volvo, the upholstery in the V50's five-passenger interior was
inspired by sportswear. The instrument panel's texture is meant to signal
technical innovation to the occupant. An Intel ...
