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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Cleaning the brake discs
Coatings of dirt and water on the brake discs
may result in delayed brake function. This delay
is minimized by cleaning the brake linings.
Cleaning the brake pads is advisable in wet
weather, p ...
Seat belt use during pregnancy
Seat belt use during pregnancy
The seat belt should always be worn during
pregnancy. But it is crucial that it be worn in the
correct way. The diagonal section should wrap
over the shoulder t ...
Electrical system
General information
12 volt system with a voltage-regulated alternator. Single pole system in which
the chassis and engine block are used as conductors. The negative terminal is connected
to the ...
