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:
Checking the engine oil
The oil level should be checked at regular intervals,
particularly during the period up to the
first scheduled maintenance service.
• See page 356 for oil specifications.
• Refer to the Warranty ...
Tire wear
Tire rotation
Your vehicle has no required tire rotation. Tire
wear is affected by a number of factors such
as tire inflation, ambient temperature, driving
style, etc.
NOTE
• If the tires are ro ...
DSTC system
The Dynamic Stability and
Traction
Control system (DSTC) ...
