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:
Gauges
Gauges in the instrument panel
1 - Speedometer
2 - Fuel gauge. Please note that the fuel level indicator in the gauge moves
from right to left as the amount of fuel in the tank decreases. The ar ...
Selecting a station (in wavebands AM/FM1/FM2)
Automatic tuning
1. Press RADIO. Continue pressing this button
to toggle to the desired waveband
(AM, FM1, etc.).
2. Release the button and wait several seconds
or press OK/MENU.
3. Press the ...
Volvo On Call
Volvo On Call is an advanced telematics system and another valuable personal
security feature. It uses an integrated GSM telephone with a built-in GPS unit
for satellite positioning, and ensures h ...
