How do states use OBD II for emission inspections?

How do states use OBD II for emission inspections?  - Emission inspection readiness - Maintaining your car - Maintenance and specifications - Volvo XC60 Owners Manual - Volvo XC60

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:

    Electrical system
    General information 12-volt system with voltage controlled generator. Single wire system in which the chassis and engine block are used as conductors, grounded on the chassis. Battery If you ...

    Reverse ®)
    The vehicle must be stationary when position R is selected. ...

    Safety
    Though its sister model, the S40 sedan, earned good crash-test scores from the Insurance Institute for Highway Safety, the wagon hasn't been crash tested. Unfortunately, differences in weight and ...