Here’s all you need to know about Partial Zero Emission vehicles

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Here’s all you need to know about Partial Zero Emission vehicles i.e. PZEV!-Brought to you by PartsAvatar auto parts.

Everyone want to buy a car with a normal combustion engine that generates less pollution and whose replacement auto parts are easier to deal with!

What are partial zero emission cars? Are these electric cars? The partial in PZEV means the car meets the emissions limits for a zero emissions vehicle(ZEV), such as an all electric or hydrogen fuel car, but it doesn’t “force technology” forward by commercializing.

Several automakers like Mazda, Subaru and Honda have produced PZEV models. Even Honda Civic 2016 is a PZEV.

What is PZEV?

To be frank, the PSEV reduces emission like smog. PZEVs are actually gasoline powered engines that are designed with advanced emission control properties. They have lower emission as compared to their counterparts.

As PZEVs are rooted in California, so the PZEVs are designed to meet state’s stringent emission control standards.

For a car to achieve the tag of PZEV it has to strictly follow certain set of rules. First and foremost it has to meet federal standards. It also have to be proven to have zero evaporative emissions and the components of the system have to be covered under a 15 year warranty.

Recently the state of California had recognized the Honda civic model with advanced technology partial zero emission vehicle because it follows the mandatory rules and has warranty to maintain emissions for 150000 miles.


When fuel system components get saturated with gasoline, they leak gas vapour through the outer surfaces, letting it evaporate into the air.

So, engineers building PZEV’s line the inside of fuel cells, seals, gaskets, fuel tanks with layers of low permeability polymers such as ethylene vinyl alcohol to keep fuel from soaking through.

Temperature swing from day to night can cause the gasoline to evaporate past the fuel cap and into the air. To capture gas before it evaporates into the atmosphere, a car fixes a canister of activated carbon in the fuel filling line from cap to gas tank.

The canister traps most of these hydrocarbons which the engine destroys by pulling them into the combustion chamber. PZEVs add an auxiliary scrubber canister of honeycomb shaped carbon that captures 95 percent or more of vapour leaking out of primary canister.

The origins of PZEV in U.S.

PZEV’s come by way of California’s zero emission vehicle mandate which is a vital portion of the state’s low emission vehicle program dating back to 1990 requiring automakers to produce either battery electric vehicles or hydrogen fuel cell powered vehicles.

Vehicles are required to meet tight emission tests requirements for volatile organic compounds, oxides of nitrogen and carbon monoxide. Manufacturers that don’t meet the standards cannot continue to sell the vehicle in the state.

California offers rebates and incentives for purchasing these cars. For those nature loving auto enthusiasts, who want decreased emissions and better mileage, there are advanced technology PZEV like Honda Civic or any other electric or hybrid model with preferred standards.


As stated above, the strict standards are to be followed. Evaporative emissions must be zero. Emissions related vehicles must be warranted for 10 years/150000 miles.

According to Honda- PZEVs are valuable for reducing pre cursors to smog forming emissions such as carbon monoxide, nitric oxide and nitrogen dioxide. But why haven’t auto giants made every fuel powered car a PZEV?

Well, expensive hardware might be a prominent reason.

PZEV must be SULEV

Before a vehicle can be certified as PZEV, it must be certified as SULEV i.e. super ultra low emission vehicles. This emission standard limits the amount of key pollutants coming from vehicle’s tailpipe and is set by U.S. environmental protection agency.

The exhaust can be clean as that of many gasoline electric hybrids without the cars incurring the hybrid’s premium price as the PZEV complies with tailpipe standards for this.

Zero emissions

PZEVs are solely for advanced emission controls but that does not mean they promise improved fuel efficiency. Most PZEVs come at about average for their class in fuel efficiency.

They come with average fuel efficiency. Hybrid or electric vehicles are classified at AT-PZEV because the emission is clean and they give better fuel efficiency.

In 2009, car makers were charged with reducing greenhouse gas emissions for new passenger cars.

Automakers have eight years to bring new vehicle manufacturing in line to cut pollutants by approximately 30 percent once fully phased in the end of 2016.

Similar standards are also part of an agreement Canada has signed with automakers. If you are environmentalist or nature lover auto enthusiast, then you can contribute in decreasing emissions by buying PZEV vehicles even if you don’t reside in California.

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A former car magazine editor, Sophie’s blog offers in-depth car reviews, industry trends, and maintenance tips. Her breadth of knowledge makes her posts invaluable for both car enthusiasts and everyday drivers.

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