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:
Indicator and warning symbols
Low oil pressure
If the light comes on while driving, stop the vehicle, stop the engine immediately,
and check the engine oil level. If the oil level is normal and the light stays on
after rest ...
Driver Alert Control (DAC)– introduction
This function is intended to alert the driver if
his/her driving becomes erratic, such as if the
driver is distracted or fatigued.
NOTE
The camera has certain limitations, see
page 159.
A c ...
Auto
The function automatically
regulates cooling, heating, blower speed, recirculation, and air distribution to
maintain the chosen temperature. If you select one or more manual functions, the
other ...
