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:
Reporting safety defects in the U.S.
If you believe that your vehicle has a
defect which could cause a crash or
could cause injury or death, you
should immediately inform the
National Highway Traffic Safety
Administration (NHTSA) in ...
Location of the keyless drive antennas
The keyless drive system has a number of antennas located at various points in
the vehicle.
1 - On the inside center of the rear bumper
2 - Left rear door handle
3 - Center of the parcel shelf, ...
Checking settings
The current Collision Warning settings can be
checked by pressing MY CAR on the center
console control panel and going to Settings
Car settings
Driver support systems
Collision Warnin ...
