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:
INFO—displaying additional information
In certain cases, more information may be
available (about a radio station, song, artist,
etc.) than is currently displayed on the screen.
Press the INFO button to display all of the
availabl ...
Emission inspection readiness
What is an Onboard Diagnostic System (OBD II)?
OBD II is part of your vehicle's computerized engine management system. It stores
diagnostic information about your vehicle's emission control ...
Three-way catalytic converter
Three-way catalytic converter -
general information
• Keep your engine properly tuned. Certain
engine malfunctions, particularly involving
the electrical, fuel or distributor ignition
systems, ma ...