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:
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 ...
Reprogramming a Single HomeLink Button
To program a device to HomeLink using a
HomeLink button previously trained, follow
these steps:
1. Press and hold the desired HomeLink button.
DO NOT release the button.
2. The indicator light ...
Fuel requir
Deposit control gasoline (detergent
additives)
Volvo recommends the use of detergent gasoline
to control engine deposits. Detergent
gasoline is effective in keeping injectors and
intake valves cl ...
