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:
Interior rearview mirror
Auto-dim function
An integrated sensor reacts to headlights from
following traffic and automatically reduces
glare in the mirror. ...
Driving Impressions
Even when equipped with the automatic transmission, the V50 2.4i accelerates
with spirit, though the engine growls when pushed. Despite a taut suspension,
ride comfort is generally satisfactory, b ...
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 160.
A ...
