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:
Electronic climate control, ECC
Temperature control, driver's side
Heated driver's seat*
Defroster (maximum effect)
Blower
Manual air distribution—floor
Manual air distribution—dashboard air vents
Manual air ...
Recirculation/air quality system
Recirculation
This function can be used to
shut out exhaust fumes,
smoke, etc., from the passenger
compartment. The air in
the passenger compartment
is then recirculated, i.e., no air
f ...
Cruise control
Steering wheel-mounted controls and display
1 - Standby mode 2 - Resume set speed 3 - Deactivating 4 - Activate/set
speed 5 - Set speed indicator (parentheses indicate standby mode)
Engaging ...
