Smog Check Cost: Parts, Labor & Average Price

A smog check, or emissions test, measures whether a vehicle's exhaust meets the standards in the state where it is registered. Not every state requires one, and the rules differ on which vehicles, which counties, and how often. In some places the state sets the fee. In others each station sets its own price.

That is why one national number does not exist. The figures below were checked on Oct 13, 2026 and come from CarRegistrationFee and state sources. Use them as a guide, then confirm the price and the rules with your own state program before you go.

Across states that require testing, published guides report $20 – $90. The most common price is $25 – $40.

State programs set up their prices in different ways. California lets stations set their own test price and adds a fixed state certificate fee. New York sets a maximum fee for the inspection, and the fee depends on region. Colorado sets one standard fee. The table shows a few examples, not every state.

Where you live matters more than anything else. Always check the program in your state for current fees. In California, the Bureau of Automotive Repair publishes the rules on its Smog Check page. Other states publish fee schedules on their motor vehicle, environmental, or air quality agency websites.

California stations can charge more for vehicles that need extra steps. Hybrids and diesels have been reported to cost more than standard gasoline cars. Older vehicles may cost more too, since fewer stations keep the older testing equipment and some require an additional evaporative test.

California also charges a separate state fee for the smog certificate. Stations must post the certificate price separately from their inspection price, which helps you compare stations fairly. Ask whether a quoted price includes it.

Published ranges look different because they measure different things. One covers every state with an emissions program. Another reports the average California station price, including the certificate. A third counts only gasoline cars from a certain model year. Because of this, a single figure may not match what a station near you charges.

• State rules. Some states set the fee, and others leave the price to stations.
• Region. Large metro areas tend to charge more than small towns.
• Vehicle type. Hybrids, diesels, and older cars may cost more.
• Station type. Some stations are test-only. Others offer repairs as well.
• Add-ons. Retests, evaporative tests, and certificate fees can change the total.
• Coupons. Many stations offer online discounts or mailers.

A failed test usually means you need repairs before you can retest. Retest policies vary. Some stations offer a free or discounted retest within a set period, and others charge again. Ask before you pay for the first test. Some states also offer repair assistance programs for qualifying drivers, so check your state program if the repair bill is large.

• Fix any warning lights before you go. A lit check engine light often means a failed test.
• Drive the car for a while before testing so the engine and catalytic converter are warm.
• Bring your registration notice, which tells you what the state requires.
• Compare prices by phone or online. Where stations set their own prices, they can vary a lot.
• Ask about the retest policy and the certificate fee.

Rules depend on the state, county, vehicle age, and fuel type. Many programs exempt newer vehicles for a number of years, and some exempt electric vehicles. Your registration renewal notice often says whether a test is required. When you buy or sell a car, the rules can change, so check your state agency.