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:
Automatic re-arming
If the doors are unlocked, the locks will automatically
reengage (re-lock) and the alarm will
re-arm after 2 minutes unless a door or the tailgate
has been opened. ...
Limitations
Distance Alert uses the same radar sensor
used by Adaptive Cruise Control and the Collision
Warning system. See page 159 for more
information on the radar sensor’s limitations.
NOTE
Strong sun ...
Location of the fuse boxes
1 Engine compartment
2 Under the glove compartment
3 Under the glove compartment
4 Cargo area ...
