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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Driving Impressions
Volvo's smallest wagon is just as refined and tightly built as the bigger
V70, if a bit snug inside. Performance is a strong point with the turbocharged
model, but the T5's ride can get rough on h ...
Air vents in the dashboard
a Open
b Closed
c Horizontal airflow
d Vertical airflow
Direct the outer air vents toward the side windows
to defrost. ...
Changing wheels with TPMS
Please note the following when changing or replacing the factory installed TPMS
wheels/ tires on the vehicle:
Only the factory-mounted wheels are equipped with TPMS sensors in the valves.
If t ...
