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:
Ignition mode functions
The various ignition modes are accessed with
the remote key in the ignition slot.
...
Engine specifications
A This engine may not be available on all markets ...
Seating
The C70 is a comfortable car if you're in one of the front seats. They have a
bit of side bolstering — so you feel like you're sitting in the seats, not
perched on top of them — but the bolstering ...
