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.
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Call settings
While a call is in progress, press OK/MENU or the thumb wheel on the steering
wheel keypad to access the following functions:
Mute: mute the infotainment system’s microphone.
Mobile phone: tra ...
Steering, brakes and transmission
The Volvo XC90 is as easy, responsive and rewarding to drive as a regular
Volvo saloon or estate model. Its torsionally rigid body, transverse engines and
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Weights
A FWD = Front Wheel Drive
B AWD = All Wheel Drive ...
