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:
Inflatable Curtain
The Inflatable Curtain (IC)
This system consists of inflatable curtains
located along the sides of the roof liners,
stretching from the front side windows to the
rear edge of the rear side windo ...
Emergency towing
Towing eyelet
Location of the towing eyelet
Attaching the towing eyelet ...
Safety
Though its sister model, the S40 sedan, earned good crash-test scores from
the Insurance Institute for Highway Safety, the wagon hasn't been crash tested.
Unfortunately, differences in weight and ...
