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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Limitations
Strong sunlight, reflections, extreme light contrasts, the use of sunglasses,
or if the driver is not looking straight ahead may make the visual warning signal
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Minimum octane
Typical pump octane label
Volvo recommends premium fuel for best performance,
but using 87 octane or above will
not affect engine reliability.
Volvo engines are designed to achieve rated
hor ...
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