A partial zero-emission vehicle, in the United States, is an automobile that has zero evaporative emissions from its fuel system, has a 15-year (or at least 150,000-mile) warranty on its emission-control components, and meets SULEV tailpipe-emission standards.
All emissions-related components, including the electric-propulsion parts of hybrid electric vehicles, must be warranted for 15 years or 150,000 miles.
CARB also prepared a TZEV (Transitional ZEV, formerly Enhanced AT-PZEV) category for plug-in hybrids (PHEVs) and hydrogen vehicles.
Except some hybrids and alternative-fuel vehicles, PZEVs do not inherently offer consumers any kind of incentives other than the extended emissions warranty.
[4] Originally, PZEVs were available only in California, Maine, Massachusetts, New York, Oregon, Vermont, some regions near those states, and Canada.