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.
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Detachable trailer hitch
Overview
A Ball holder
B Locking bolt
C Cotter pin
D Hitch assembly
E Safety wire attachment
Installing the ball holder
1. If necessary, remove the cotter pin from
the locking bolt and slide ...
Deposit control gasoline (detergent additives)
Volvo recommends the use of detergent gasoline
to control engine deposits. Detergent
gasoline is effective in keeping injectors and
intake valves clean. Consistent use of deposit
control gasol ...
Reduced alarm function
Turning off the accessory alarm sensors
In certain situations it may be desirable to turn
off the accessory inclination and movement
alarm sensors if, for example, you drive your
vehicle onto a ...
