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:
Recycling
As part of Volvo’s commitment to the environment,
it is essential for the vehicle to be recycled
in an environmentally sound way. Almost
the entire vehicle can be recycled and for that
reason, ...
Cleaning the brake discs
Coatings of dirt and water on the brake discs may result in delayed brake function.
This delay is minimized by cleaning the brake linings.
Cleaning the brake pads is advisable in wet weather, prior ...
Driving on rough/unpaved surfaces
The Volvo XC90 is designed primarily for onroad
driving, and it has excellent handling characteristics
on very rough or unpaved roads.
When driving on poorly maintained or unpaved
roads, please ...
