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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Erasing warning messages
When a low tire pressure warning message has
been displayed, and the tire pressure warning
light has come on:
1. Use a tire pressure gauge to check the
inflation pressure of all four tires.
2. ...
Global sales
The first-generation Volvo S60 was launched in 2000. It soon became Volvo
Cars' most popular model, enjoying worldwide acclaim and peak sales of 110,000
cars in 2002. In total, there are about one ...
Repeat folder
This function makes it possible to play files in
a folder repeatedly. When the last file has been
played, the first file will begin again. To activate:
1. Press OK/MENU.
2. Turn TUNE to Repeat f ...
