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:
Checking tire pressure
Cold tires
Inflation pressure should be checked when the tires are cold.
The tires are considered to be cold when they have the same temperature as the
surrounding (ambient) air.
This temperature ...
Living With the C30
You'd be forgiven for thinking "hatchback = practical," but that's not quite
the case with the C30. Sure, it's more practical than a two-seat roadster, but
this isn't a family car — unle ...
Storing preset stations
Ten preset stations can be stored for each waveband (AM, FM1, etc.).
Stored preset stations are selected using the number key buttons on the center
console. Manually storing preset stations
1. Tun ...
