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:
Audible/visual alarm signal
• An audible alarm signal is given by a battery
powered siren. The alarm cycle lasts
for 30 seconds.
• The visual alarm signal is given by flashing
all turn signals for approximately 5 minutes ...
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
...
Connecting cell phones
The procedure for connecting a cell phone varies,
depending on the phone itself and on
whether or not the phone has been previously
paired with the infotainment system (see page
231 for instru ...
