Starting with 2009 models, new and used passenger cars, light duty trucks, and medium duty passenger vehicles must be certified to California emission standards. Vehicles must be certified to at least one of the following emission standards to be registered, leased, rented, licensed, or sold for use in Washington:
Vehicles that are "federally certified" or "certified to meet EPA standards" aren't certified to California emission standards and don't meet Washington State requirements.
Washington doesn't require automakers to offer additional extended warranties for sales of Zero Emissions Vehicles like California. However, the Department of Ecology encourages automakers to offer and honor those extended warranties voluntarily as a service to their customers.