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 and adding oil
Location of the filler cap and dipstick
Volvo recommends Castrol oil products
NOTE
Before checking the oil:
• The car should be parked on a level surface.
• If the engine is warm, wait for at ...
Cleaning the interior
Only use cleaning agents and car care products recommended by Volvo. Clean regularly
and follow the instructions included with the car care product.
Upholstery care
Fabric
Clean with soapy water ...
Glove compartment
The glove compartment can only be locked and unlocked using the detachable key
blade in the remote key. See page 59 for information on removing the key blade from
the remote key.
Insert the ke ...
