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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Radio text
This text provides information about the song that is currently playing. To turn
this feature on or off, press OK/MENU and scroll to Show radio text and press OK/MENU
to toggle between on or off. ...
Remote control
The remote control included with the Rear Seat
Entertainment system (RSE)* can be used to
control all of the infotainment system's functions.
To use the remote, begin by pressing its
button to ...
How can my vehicle fail OBD II emission inspection?
Your vehicle can fail OBD II emission inspection
for any of the following reasons.
• If your Check Engine (MIL) light is lit, your
vehicle may fail inspection.
• If your vehicle's Check Engine l ...
