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:
Driving Dynamics: Chassis
The compact Volvo V50 Sportswagon delivers an engaging, dynamic driving
experience with a high level of active safety. To achieve this, it makes use of
a sophisticated suspension system, a high le ...
Environment
Good environmental protection is one of Volvo's cornerstones. All of the
engines available in the all-new Volvo S80 are outstandingly economical, given
their performance.
The manual diesel engin ...
Front park assist
The distance monitored in front of the vehicle
is approximately 2.5 ft (0.8 m). The audible signal
comes from the audio system's front
speakers.
It may not be possible to combine auxiliary
...
