Beginning January 2010, state law requires certain diesel powered vehicles to be included in the Smog Check Program. This Includes all model year 1998 and newer diesel vehicles with a gross vehicle weight rating for up to 14,000 pounds and less.
The diesel vehicle Smog Check consists of an on-board diagnostic test, a visual inspection of the emission components and a visible smog test.
If your vehicle fails the Smog Check, you may qualify for financial assistance of up to $500.00 toward emissions-related repairs, or you may be eligible to receive $1000.00 to retire your vehicle.
for more info please visit http://www.smogcheck.ca.gov/
or call toll -free 1-800-952-5210