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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Power seat
1 - Front edge of seat cushion up/down
2 - Seat forward/rearward and up/down
3 - Backrest tilt ...
Main FM1/FM2 menu
FM menu
Show radio text
Show presets
Scan
Advanced settings
Reset all FM settings
Audio settings ...
Troubleshooting
If Windscreen Sensors blocked appears in
the information display, this indicates that the
City Safety™ laser sensor is obstructed in
some way and cannot detect vehicles ahead of
you, which mea ...
