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:
When does BLIS function
The system functions when your vehicle is
moving at speeds above 6 mph (10 km/h).
When you pass another vehicle:
The system reacts when you pass another
vehicle at a speed of up to 6 mph (10 km/ ...
MY CAR
When the MY CAR symbol has been selected, the following menu alternatives are
displayed.
My S60
Support systems
Settings
My S60
The display shows all of the vehicle's driver su ...
Filling washer fluid
Location of the washer fluid reservoir
The windshield and headlight washers share a common reservoir.
The washer fluid reservoir is located on the driver's side of the engine compartment.
Du ...
