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:
Calibration
The compass may need to be calibrated if, for
example, the vehicle is driven into a new magnetic
zone. The character C is shown in the
mirror's display if calibration is necessary.
1. Stop the ...
Removing and storing the cargo net
Press the release buttons on the locks on
the straps and pull out a small section of
the strap.
Press in the catches on the straps' hooks
and remove the hooks from the eyelet.
Fold u ...
Erasing warning messages
When a low tire pressure warning message has
been displayed, and the tire pressure warning
light has come on:
1. Use a tire pressure gauge to check the
inflation pressure of all four tires.
2. ...
