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:
Hazard warning flashers
Location of the hazard warning flasher button
The hazard warning flasher should be used to
indicate that the vehicle has become a traffic
hazard.
To activate the flashers, press the button
i ...
Tire sealing system–overview
Speed limit sticker
On/Off switch
Electrical wire
Bottle holder (orange cover)
Protective hose cover
Air release knob
Hose
Bottle with sealing compound
Air pressure gauge
...
Marker lines
1 - Marker line for a 1-foot (30-centimeter) zone behind the vehicle 2 - Marker
line for the clear back-up zone 3 - "Wheel tracks"
The solid line (1) indicates a zone within 1 ft (30 ...
