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:
Limitations
In certain situations, the BLIS indicator light(s)
may illuminate even when there are no other
vehicles in the area monitored by the system.
NOTE
If the BLIS indicator lights illuminate occasional ...
Removing the key blade
Slide the spring loaded
catch to the side.
Pull the key blade straight
out of the remote key. ...
Introduction
System overview
1 Cell phone
2 Location of the microphone
3 Steering wheel keypad
4 Center console control panel and display ...
