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:
All Wheel Drive
All Wheel Drive (AWD) – general
information
Your Volvo can be equipped with an electronically
controlled All Wheel Drive system, which
means that power is distributed automatically
between the fr ...
Listening to satellite radio
The Sirius satellite system consists of a number
of high elevation satellites in geosynchronous
orbit.
NOTE
• The digital signals from the Sirius satellites
are line-of-sight, which means that
p ...
Faults in the system
If the yellow warning symbol
illuminates
and PARK ASSIST
SERVICE REQUIRED is shown
on the information display, this
indicates that the system is not
functioning properly and has been disengage ...
