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:
Cleaning the seat belts
Clean only with lukewarm water and a mild
soap solution. ...
Automatically folding down the rear seat’s outboard head restraints
Automatically folding down the rear seat’s outboard head restraints
1. The ignition must be in mode I or II.
2. Press the button to lower the rear head
restraints for improved visibility.
NOTE
...
Maintenance
• Use a screw driver to open the caps or
cover and a flashlight to inspect the level.
• If necessary, add distilled water. The level
should never be above the indicator.
• The fluid level should ...
