Smog Check Las Vegas: Who Needs It, What It Costs and Failed Tests
Most gas and diesel vehicles based in the Las Vegas Valley need a passing smog check every year before the registration can be renewed. Find out if yours does, what a Clark County test can cost in 2026, and the exact steps to a waiver if your car fails.
Written by the DMV Appointment Las Vegas team · Verified by Ryan Parker & Ethan Miller · Last updated: November 2026
Smog check planner
Answer a few questions to see if you need a test, what it can cost, and whether a failed car can get a waiver.
Who needs a smog check in Las Vegas?
You need a smog check in Las Vegas if your vehicle is based in the urban part of Clark County, is a 1968 or newer model, runs on gasoline or is a diesel up to 14,000 lbs, and isn’t on one of its first three registrations as a new car. The test is required every year before the registration renews.
The Las Vegas Valley plus a five-mile buffer around it.
Vehicles from model year 1967 and older are exempt.
Gas vehicles of any weight, and diesels with a GVWR up to 14,000 lbs.
New cars start testing at the fourth registration; hybrids in their sixth model year.
Once the test is on file, you can renew. You’ll find every renewal option in our Nevada registration renewal guide.
Which vehicles are exempt from a smog check in Nevada?
New cars on their first three registrations, hybrids in their first five model years, electric vehicles, motorcycles, 1967 and older models and diesels over 14,000 lbs don’t need a smog check. Neither do vehicles based outside the Las Vegas testing area and some ownership transfers.
- New vehicles on their first three registrations
- New hybrids for their first five model years
- Electric vehicles, and vehicles that run permanently on propane, CNG, methane or butane
- Model year 1967 or older
- Motorcycles and mopeds
- Diesels with a gross vehicle weight of 14,001 lbs or more
- Classic Vehicle, Classic Rod or Old Timer plates driven 5,000 miles a year or less
- Replica Vehicle registrations
- Vehicles based outside the Las Vegas and Reno testing areas
- A sale or transfer within 90 days of the last test (180 days on a Nevada dealer sale)
- Transfers between a husband and wife
- Fleet vehicles in the DMV’s Continuous Monitoring Program
Classic plates: the exemption needs classic or antique vehicle insurance and a yearly mileage certification (form EC 018). Your renewal notice may still say “Smog Check Required,” but you can renew online, in person or by mail. Go over 5,000 miles and you’ll need a test, an in-person renewal and a different plate style.
Where is a smog check required in Clark County?
Testing covers vehicles based in the Las Vegas Valley and a five-mile buffer around it. That includes Mount Charleston, Blue Diamond and Bonnie Springs. Goodsprings, Jean and Cold Creek are exempt, and so is most of rural Clark County.
Test required
- Las Vegas, North Las Vegas and Henderson
- Mount Charleston, including Kyle Canyon and Lee Canyon roads
- Blue Diamond
- Bonnie Springs
How much does a smog check cost in Las Vegas?
In 2026, a Clark County smog station can charge up to $75.50 for a gas car or light truck, $75 for a heavy-duty gas vehicle and $90 for a diesel. Each total includes a $7 certificate fee. Renewing your registration at the station can add up to $10.
| Vehicle | Inspection | Certificate | Maximum total |
|---|---|---|---|
| Light-duty gasUp to 8,500 lbs | $68.50 | $7 | $75.50 |
| Heavy-duty gas8,501 lbs and up | $68 | $7 | $75 |
| DieselUp to 14,000 lbs | $83 | $7 | $90 |
These are ceilings, not set prices. The DMV sets them each year from a survey of local labor rates, stations must post their fees, and any discount is up to the station. See the DMV’s Emission Control Program page for the current bulletin.
How do you get a smog check in Las Vegas?
Find a licensed emissions station, drive in during its hours and pay the posted fee. Newer cars are tested by plugging into the on-board computer. The result goes to the DMV electronically, and you can renew your registration once it passes.
- 1Find a licensed station
Use the DMV’s online emission station search. It also shows stations that renew registrations and stations that do repairs.
- 2Get the test done
For 1996 and newer cars, the test reads the on-board diagnostics (OBD II) instead of measuring the tailpipe. Older vehicles get a tailpipe test.
- 3Keep the result on file
A pass is good for 90 days, or 180 days when it comes with a Nevada dealer sale. Time it close to your renewal.
- 4Renew your registration
Renew at the station for up to $10 extra, or later online, at a DMV Now kiosk or at a AAA branch with DMV services.
Will my car pass with the check engine light on?
No. On a 1996 or newer car, a lit check engine light is a fail. The DMV still suggests getting tested, because that failed test is the first step toward a waiver if the repair turns out to be expensive.
Check the gas cap first. A loose cap is one of the most common causes.
Wait before testing. The car may need up to a week of mixed driving, or the result comes back “Rejected,” which means not ready, not failed.
That points to a serious problem. The DMV says to pull over and stop driving.
What happens if your car fails the smog check?
You can’t renew until the car passes. Get it repaired and retested. If it still fails after qualifying repairs at a 2G-licensed station costing at least $450 in Clark County, take it to the DMV Emission Lab to ask for a one-year waiver.
- 1Keep the failed certificate
You’ll need it, and the second one, for any waiver request.
- 2Repair at a 2G station
For a waiver in Clark County, repairs must be done at a 2G-licensed authorized station, with receipts showing at least $450 on emissions-related parts and labor.
- 3Retest
A pass after repairs means you can renew as usual.
- 4Still failing? Ask for a waiver
Bring the vehicle, both failed certificates and every repair receipt to the Emission Lab at 2621 E. Sahara Ave. A waiver lasts one year, and the car must be fixed before the next registration year.
Can qualify for a waiver
- 1968–1995 light-duty and all heavy-duty vehicles failing for carbon monoxide or hydrocarbons
- 1996 and newer light-duty vehicles failing for the check engine light
Never gets a waiver
- Repairs a warranty should cover
- Visible smoke, which must be fixed at any cost
- Tampered emission equipment, which must be fixed at any cost
- In Clark County, repairs done at a shop that isn’t 2G licensed
Clark County rules only: Washoe County (Reno) has its own, lower repair limits for a waiver.
Help paying for repairs: the Clark County Division of Air Quality’s Smog Free Clark County program may pay up to $975 toward emissions repairs on 1968–1999 vehicles, with owner income limits. Registration already expired while you sort it out? You can get a movement permit online or at a DMV office.
Do you need a smog check when you buy a car or move here?
Usually, yes. A used car dealer must hand over a passing test for a vehicle that will be registered in Clark County. In a private sale, the test is the buyer’s job. New residents need a Nevada test before they register.
Buying from a private seller
Get the test yourself unless the seller’s pass is less than 90 days old. Then follow our Nevada title transfer checklist.
Just moved to Las Vegas
Pass a Nevada smog check before your registration visit; it’s one step in the new resident 30-day plan.
Smoking cars: no gasoline vehicle in Nevada may give off visible smoke, in any county. You can report one through the DMV’s Smog Spotter program at 844-END-SMOG, and the DMV will investigate any vehicle with Nevada plates.
Need a DMV office after your smog check?
Most drivers never need the counter: pass the test, then renew online, at a kiosk or at the station. Book a free DMV appointment for things like switching to classic plates, a registration expired more than 18 months, or a first Nevada registration.
Book, view, reschedule or cancel
Check one office, then switch to the next. Each button opens that office’s official booking page.
East Sahara DMV
2621 E. Sahara Ave., Las Vegas, NV 89104 · Mon–Fri 8–5, Sat 8–4
All official booking links
- East Sahara: general appointment · drive test
- West Flamingo: general appointment · drive test
- North Decatur: general appointment · drive test
- Silverado Ranch: general appointment · drive test
- Silverado CDL building: CDL line or knowledge test
- All offices on dmv.nv.gov
Smog check Las Vegas FAQ
Do I need a smog check in Henderson or North Las Vegas?
Yes, for most vehicles. Henderson and North Las Vegas are inside the Las Vegas Valley testing area, so the same Clark County rules and exemptions apply.
How long is a Nevada smog check good for?
A passing emissions test is valid for 90 days, or 180 days when it comes with a Nevada dealer sale. Renew within that window so the test is still on file.
Does a new car need a smog check in Nevada?
Not right away. New vehicles skip testing for their first three registrations and start at the fourth. New hybrids are exempt for their first five model years.
Can I renew my registration at the smog station?
Yes, at stations that offer renewals. They can charge up to $10 for the service on top of the test. Otherwise, renew online or at a DMV Now kiosk once the pass is on file.
Who pays for the smog check when you buy a used car in Nevada?
In a private sale, the buyer does. A used car dealer must provide a passing test for a vehicle that will be registered in Clark or Washoe County.
Can I get a smog check waiver every year?
A waiver only covers one registration year. The DMV says the vehicle must be repaired before the next registration year, so plan the repair rather than counting on another waiver.