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:
Severe strain on the brake system
The brakes will be subject to severe strain when driving in mountains or hilly
areas, or when towing a trailer. Vehicle speed is usually slower, which means that
the cooling of the brakes is less ...
Manually unlocking the fuel filler door
Panel on passenger's side of cargo area
To manually unlock the fuel filler door
1. Open the upper and lower sections of the
tailgate, and fold up the rear section of the
cargo area floor.
2. If ...
Operation and function
LDW can be switched on or off by pressing the
button on the center console. A light in the button
illuminates when the function is on.
The trip computer display shows Lane Depart
Warn Standby ...
