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:
Safety
Volvo’s Roll Stability Control System employs a gyrosensor. If the rollover
risk reaches a specified threshold, Dynamic Stability Traction Control is
activated. Inflatable side curtain-type airbag ...
Function
Function overview
1 Warning light, braking by driver required
2 Controls in steering wheel
3 Radar sensor in front grille
Adaptive Cruise Control consists of:
• A cruise control system to maint ...
Automatic transmission
Shiftgate positions
Depress the button on the front of the gear
selector knob to move the gear selector
between the R, N, D, and P positions.
The gear selector can be moved freely between
th ...
