To find out whether a car, truck or motorcycle is California certified, check the emission label under the hood. For a motorcycle check the frame or refer to your owner's manual. The label should read that the vehicle conforms to California regulations, or that it is legal for sale in California.
If you are moving to California from another state, you may register a new 49-State vehicle if it was first registered by you in your home state, or for military personnel, in the last state of your military service. When applying for vehicle registration in California, you must provide evidence that the vehicle was registered.