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.
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RADIO menus
Main AM menu AM menu
Show presets Scan Audio settings1
Sound stage Equalizer Volume compensation Reset all audio settings
Main FM1/FM2 menu FM menu
Show radio text Show pre ...
Limitations
In certain situations, the BLIS indicator light(s)
may illuminate even when there are no other
vehicles in the area monitored by the system.
NOTE
If the BLIS indicator lights illuminate occasional ...
Front airbags
Front airbags ...
