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.
See also:
Defroster
This function defrosts/de-ices
the windshield and front side
windows. The indicator light
in the defroster button lights
when the function is active.
• Blower speed increases automatically ...
Automatic Locking Retractor/Emergency Locking Retractor (ALR/ELR)
To make child seat installation easier, each
seat belt (except for the driver's belt) is equipped
with a locking mechanism to help keep the
seat belt taut.
When attaching the seat belt to a child
...
Pedestrian safety
The Volvo V50 Sportswagon has been designed to minimise the risk of injury to
pedestrians and cyclists in the event of an accident. The smoothly shaped front
has an energy-absorbing structure ahea ...
