Find the updated 2013-2014 information here
Frequently Asked Questions (Part 1)
For diesel-powered vehicles 1998 model year and newer 14,000lbs and less are subject to the biennial Smog Check Pragram. The six year exemption does not apply to diesel vehicles.
- A visual inspection, in which required emissions control components and systems are identified, and must appear connected and functional.
- A functional inspection which includes, as applicable, checking the functionality and/or integrity of the emissions control malfunction indicator light ("Check Engine", etc), the ignition timing, the gas cap, and the Exhaust Gas Recirculation (EGR) system, if the vehicle is so equipped and a Two-Speed Idle (TSI) test is being performed. A Low Pressure Fuel Evaporative Test (LPFET) is performed on all 1995 and older vehicles. A functional check of a vehicle's On-Board Diagnostic (OBD) system is also performed on 1996 and newer vehicles. Diagnostic information stored in the vehicle's computer is reported on the Vehicle Inspection Report (VIR) that the motorist receives at the end of the Smog Check inspection. OBD information can save time and money when repairs are required.
- A tailpipe emissions test, which measures exhaust emissions using a probe inserted into the vehicle's tailpipe during testing. Vehicles pass or fail this part of the Smog Check inspection based on established emission standards, sometimes called cutpoints.
- You must use Original Equipment Manufacturers (OEM) specification parts for use in your specific year, make, and model of vehicle.
- The part must have an Executive Order (EO) number that shows it has been exempted by the California Air Resources Board for use in your vehicle.
- The equipment used must be certified by the U.S. Environmental Protection Agency (USEPA) for use in your specific year, make, and model of vehicle.
- If you have not yet completed a Smog Check inspection, do so. Once DMV receives the electronic transmission, the DMV database will be updated and your registration and sticker will be issued. No further action is required on your part.
- If you have already successfully completed a Smog Check inspection and 30 days have elapsed, contact DMV for additional instructions.