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:
Stage 2: Checking inflation pressure
1. Connect the tire sealing system as described
in stage 1.
2. Refer to the inflation pressure table in this
chapter for the correct inflation pressure. If
the tire needs to be inflated, start ...
Selecting a channel
There are three ways of tuning in a channel:
Using the left and right arrow keys to go to the next channel. Skipped channels
(see page 220) will be excluded.
By turning the TUNE control and s ...
Inflation placard
Tire inflation placard ...
