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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Start
Ignition switch with remote key inserted ( see page 82 for more information
on ignition modes)
WARNING
Before starting the engine:
• Fasten the seat belt.
• Check that the seat, steering wheel ...
Front park assist
The distance monitored in front of the vehicle is approximately 2.5 ft (0.8 m).
The audible signal comes from the audio system's front speakers.
It may not be possible to combine auxiliary he ...
Installing the steel cargo grid
For information about the necessary tools and
procedures for installing/removing the steel
cargo grid, please refer to the assembly
instructions that were included when the grid
was purchased. ...
