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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Interior
Seating either five or seven people, the XC90 has a 40/20/40-split second-row
bench. With the seven-passenger configuration, a child booster seat in the
second row can slide forward, nearly betwee ...
Replacing fuses
1 Relays/fuse box in the engine compartment
2 Fuse box in the passenger compartment,
behind the plastic cover
3 Fuse box in the passenger compartment,
on the edge of the dashboard
4 Fuse box in ...
Under the Hood
A 2.4-liter inline-five-cylinder produces 168 horsepower in the 2.4i.
High-performance T5 editions employ a turbocharged 2.5-liter
inline-five-cylinder that now generates 227 hp (up from 218 hp) a ...
