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:
Seat belt reminder
Seat belt reminder light in ceiling console
The seat belt reminder consists of an audible signal, an indicator light near
the rearview mirror and a symbol in the instrument panel that alert all o ...
Coolant
Location of the coolant reservoir
Normally, the coolant does not need to be
changed. If the system must be drained, consult
a trained and qualified Volvo service technician.
See page 357 for i ...
Types of lists used in the manual
Procedures
Procedures (step-by-step instructions), or
actions that must be carried out in a certain
order, are arranged in numbered lists in this
manual.
1 If there is a series of illustration ...
