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:
Manual operation
1. Opening the sun shade: Pull the control
back to the first stop (the manual open
position) and hold it until the sun shade has
opened to the position of your choice.
2. Opening the rear edge ...
RSE front screen menus
To access this menu, begin by selecting RSE
under MEDIA by pressing this button on the
front center console (or by using the remote
control or the steering wheel keypad). Continue
by pressing ...
Warranty
As you'd expect, the Volvo S40 saloon is supported by a comprehensive
warranty. The standard mechanical warranty is three years/60,000 miles
(whichever comes first), plus there's a three-year, unl ...
