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.
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Lighting panel
Overview, light switches
1 Thumb wheel for adjusting display and
instrument lighting
2 Rear fog light
3 Headlights/parking lights
Instrument lighting
Illumination of the display and instrumen ...
Under the Hood
A 2.4-liter inline-five-cylinder produces 168 horsepower in the base wagon.
The high-performance T5 holds a turbocharged 2.5-liter five-cylinder that
generates 218 hp and 236 pounds-feet of torque ...
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 ...
