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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Range
The PCC's lock and unlock functions have a range of approximately 60 ft. (20
m) from the vehicle.
NOTE
The approach lighting, panic alarm, and the functions controlled by the
inform ...
Snow chains, snow tires, studded tires
Snow chains
Snow chains can be used on your Volvo with the following restrictions:
Snow chains should be installed on front wheels only. Use only Volvo approved
snow chains.
If accessory, af ...
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