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:
Removing the remote key
The remote key can be removed from the ignition
slot by pulling it out. ...
Function
Park assist button
The system is activated automatically when the
vehicle is started. The indicator light in the button
in the center console illuminates when the
system is on.
• The front p ...
How BLIS functions in daylight anddarkness
Daylight
BLIS reacts to the shape of surrounding vehicles.
The system is designed to help detect
motor vehicles such as cars, trucks, buses,
motorcycles, etc.
Darkness
BLIS reacts to the headl ...
