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:
Disconnecting an external device
The external device is automatically disconnected
from the audio system if it is moved out
of range. ...
Air conditioning
The vehicle is equipped with Electronic Climate
Control (ECC). The climate control system
cools, heats or dehumidifies the air in the passenger
compartment.
NOTE
• The air conditioning can be ...
Basic infotainment functions
Controls in the center console for basic infotainment functions
1 - SOUND: press this button to access the menu for adjusting bass, treble, etc.
See page 211 for additional information.
2 - VOL: ...
