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:
Power brakes function only when the engine is running
The power brakes utilize vacuum pressure which is only created when the engine
is running. Never let the vehicle roll to a stop with the engine switched off.
If the power brakes are not working, co ...
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 ...
Types of lists used in the manual
Procedures
Procedures (step-by-step instructions), or actions that must be carried out in
a certain order, are arranged in numbered lists in this manual.
If there is a series of illustrations asso ...
