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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Light switches, front roof lighting
1 - Drivers side front reading light, on/off
2 - Passenger's side front reading light, on/off
3 - Overhead courtesy lighting.
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Quality and equipment
In the Volvo XC90 considerable importance has been attached to providing a
comprehensive standard specification to reflect the upmarket ambience of the car
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Luxurious touches such as the ...
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