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 DYNAMICS: POWERTRAINS
All C30s are front-wheel drive, with the transverse engine design improving
space efficiency. It also improves safety by creating a generous crumple zone in
the engine compartment. The five-cylinder ...
Power steering fluid reservoir
The fluid level should always be between the
ADD and FULL marks.
Fluid type: Volvo synthetic power steering fluid
(Pentosin CHF 11S) P/N 1161529 or equivalent.
Replace: No fluid change requi ...
Anti-lock braking system (ABS)
The Anti-lock Braking System (ABS) helps to improve vehicle control (stopping
and steering) during severe braking conditions by limiting brake lockup. When the
system "senses" impending ...
