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:
Situations where ACC may not function optimally
WARNING
• The radar sensor has a limited field of
vision. In some situations it may detect
a vehicle later than expected or not
detect other vehicles at all.
• If ACC is not functioning proper ...
Keyless drive remote key and driver's seat/door
mirror memory
• When you leave the vehicle with a PCC in
your possession and lock any door, the
position of the driver's seat and door mirrors
will be stored in the seat's memory.
• The next time a door is o ...
Weight distribution affects handling
At the specified curb weight your vehicle has a tendency to understeer, which
means that the steering wheel has to be turned more than might seem appropriate
for the curvature of a bend. This ensu ...
