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:
Replacing parking light/side markerlight bulbs
1. Turn the lamp holder approximately 1/4
turn counterclockwise and pull it out of the
headlight housing.
2. Pull the bulb straight out.
3. Align the guide lugs on the side of the base
of the n ...
Bluetooth® hands-free
This feature makes it possible to set up a wireless
connection between a Bluetooth®-enabled
cell phone and the vehicle’s infotainment
system. This enables the infotainment system
to function a ...
Replacing the battery
1. Switch off the ignition.
2. Wait at least 5 minutes after switching
off the ignition before disconnecting the
battery so that all information in the vehicle's
electrical system can be stored ...
