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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In phone mode, a paired phone can be
removed from the list of phones in Phone
menu
Remove Bluetooth device. ...
Electronic climate control, ECC
Temperature control, driver's side
Heated driver's seat*
Defroster (maximum effect)
Blower
Manual air distribution—floor
Manual air distribution—dashboard air vents
Manual air ...
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