Smog Check Basics

The state of California requires every gasoline and natural gas powered automobile and truck, 1976 and newer, to pass a Smog Check. In some areas of the state a biennial (every 2 years) inspection is required. This would happen every other year the vehicle registration is renewed. In all parts of the state a Smog Check is required on transfer of ownership and initial registration into the state. Currently 1976 - 2001 model years are subject to the biennial inspections. We will soon be moving on to the 2002 model year.

As is usual with the state, the powers that be have made some exceptions:

Beginning January 1, 2005, vehicles 6 or less model-years old are exempt from the biennial Smog Check inspection requirement.

Beginning January 1, 2005, vehicles 4 or less model-years old are exempt from the Smog Check inspection requirement upon change of ownership and transfer of title transactions with DMV.

Beginning April 1, 2005, vehicles being initially registered in California that were previously registered in another state are exempt if the vehicle is a 1975 and older model-year vehicle. Newer vehicles, the first 6 model years, are not exempted upon initial registration in California. These vehicles are required to undergo a Smog Check Inspection.


The Smog Check has three components. The Visual Inspection, the Functional Test, and the Emissions Test. The vehicle must pass all three to pass the Smog Check.


The Visual Inspection:
All required emissions control components and systems are identified, and must appear connected and functional.

The Functional Inspection:
This includes checking the operation of the emissions control warning indicators, ("Check Engine" light or Service Engine Soon light), 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 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.

The Emissions Test:
This 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.

Repair shops displaying this sign can perform an official Smog Check and perform repairs should your car fail.




More to come...
Thanks,
Bob