What Smog Check Requires in Reno

Reno and Washoe County follow Nevada's vehicle emissions inspection program, which is separate from California's smog check system even though the two states border each other. If you live or register your vehicle in Washoe County (which includes Reno), you need to pass an emissions test every two years as part of your vehicle registration renewal. The test checks whether your vehicle's exhaust meets Nevada state pollution standards.

The inspection itself takes about 30 minutes and costs between $30 and $50, depending on which testing station you visit. You cannot register your vehicle or renew your registration without a passing emissions test result on file with the Nevada Department of Motor Vehicles (DMV). If your vehicle fails, you have a set period to repair it and retest before your registration expires.

Key Takeaways

  • Nevada's emissions test is required every two years in Washoe County and is tied directly to vehicle registration renewal.
  • The test costs $30 to $50 and takes about 30 minutes at any authorized testing station in the Reno area.
  • Vehicles that fail the test must be repaired and retested before registration can be renewed, with a grace period that varies by situation.
  • Diesel vehicles, motorcycles, and vehicles over 30 years old have different testing rules or may be exempt entirely.
  • You can find authorized testing stations through the Nevada DMV website or by calling your local DMV office in Reno.

Which Vehicles Must Be Tested in Washoe County

Most gasoline-powered passenger vehicles registered in Washoe County must pass the emissions test. This includes sedans, SUVs, pickup trucks, and vans. However, several categories of vehicles are exempt or follow different rules.

Vehicles manufactured before 1975 are exempt from testing. Motorcycles are also exempt. Diesel-powered vehicles have their own separate inspection process that focuses on visible smoke and particulate emissions rather than the tailpipe gas analysis used for gasoline vehicles. If you own a diesel truck or van, you will be directed to a diesel-specific testing station.

Electric vehicles do not require emissions testing because they produce no tailpipe emissions. Hybrid vehicles that still have a gasoline engine must be tested like any other gasoline vehicle. If you are unsure whether your specific vehicle is exempt, the Nevada DMV website lists exemptions by model year and fuel type, or you can call the Reno DMV office directly.

How to Find a Testing Station and Schedule Your Test

Authorized emissions testing stations are scattered throughout Reno and Washoe County. The Nevada DMV maintains a searchable list of all licensed testing facilities on its website, organized by location. You can search by city or zip code to find stations near your home or workplace.

Most testing stations operate on a walk-in basis and do not require an appointment, though some larger facilities may offer scheduling. Call ahead if you want to confirm hours or ask whether they have a wait. Bring your vehicle registration and a valid photo ID. The tester will run your vehicle through a standardized emissions protocol, which involves connecting a probe to your exhaust system and measuring pollutants like nitrogen oxides, hydrocarbons, and carbon monoxide.

If your vehicle passes, the testing station sends the result electronically to the Nevada DMV. You will receive a printed receipt, and your registration record will be updated within one to two business days. You do not need to visit the DMV in person after a passing test.

What Happens If Your Vehicle Fails the Test

A failed emissions test means your vehicle's exhaust exceeds Nevada's pollution limits in one or more categories. The testing station will provide a detailed report showing which pollutants were out of range and by how much. This report is your starting point for repairs.

You have until your registration expiration date to repair the vehicle and pass a retest. If your registration expires before you can complete repairs, you can request a temporary extension from the Nevada DMV, though the length of this grace period depends on your specific situation and when you failed the test. Contact the Reno DMV office to discuss your timeline before your registration date passes.

Common reasons for failure include a faulty oxygen sensor, a malfunctioning catalytic converter, a loose or damaged gas cap, or engine problems that trigger the check engine light. A mechanic can read your vehicle's diagnostic codes to pinpoint the issue. Some repairs are inexpensive (a gas cap costs $15 to $30), while others (catalytic converter replacement) can run $800 to $2,000 or more. After repairs, you return to any authorized testing station for a retest, which costs the same as the initial test.

Timing and Registration Renewal

Your emissions test is valid for two years from the date you pass it. Nevada ties the test directly to your vehicle registration cycle, so you need a passing result before your registration expires. The DMV will not renew your registration without a current emissions test on file.

You can take the emissions test up to 90 days before your registration expires. This gives you a window to test early if you want to avoid a last-minute rush. If you wait until the last week and your vehicle fails, you may not have time to repair and retest before your registration important date, which can result in driving an unregistered vehicle—a violation that carries fines.

Plan to test at least 30 days before your registration expires to give yourself time for repairs and a retest if needed. Check your registration renewal notice for your expiration date, or log into your Nevada DMV account online to see when your test is due.

Costs and What to Expect at the Testing Station

The emissions test itself costs $30 to $50 depending on the testing station and vehicle type. Diesel vehicles may cost slightly more. This fee is separate from your vehicle registration renewal fee, which you pay to the DMV.

When you arrive at a testing station, the process is straightforward. The technician will verify your vehicle information, run your vehicle's identification number (VIN) through the system, and then connect a probe to your exhaust tailpipe. The test takes 5 to 15 minutes of actual testing time, though you may wait 15 to 30 minutes depending on how busy the station is. The technician will not perform any repairs or modifications to your vehicle—they only measure emissions and report the results.

If you fail, you pay the test fee but do not pay again until you retest. Some testing stations offer discount packages if you need multiple retests, though this is not standard. Always ask for an itemized receipt showing the test fee and the results.

Special Situations and Exemptions

If you recently moved to Washoe County from another state, you have 60 days to obtain a Nevada emissions test before your out-of-state registration expires. You cannot straightforward transfer your old state's inspection to Nevada—you must take the Nevada test.

If you own a vehicle that is registered outside Washoe County but you live or work in the county, you are not required to test it in Nevada unless you register it here. However, if you plan to register it in Washoe County, it will need to pass the Nevada emissions test.

Vehicles with a "check engine" light on will typically fail the emissions test because the light indicates a diagnostic trouble code related to emissions. You must have the code read and the underlying problem fixed before retesting. Many auto parts stores read diagnostic codes for free, which can help you understand what repair is needed.

Frequently Asked Questions

Can I test my vehicle in California if I live in Reno?

No. Nevada and California have separate emissions programs. If your vehicle is registered in Washoe County, Nevada, you must pass Nevada's emissions test. California's smog check does not transfer to Nevada registration.

What if I fail the test twice?

You can retest as many times as needed until you pass. Each retest costs the same as the initial test. If you are having repeated failures, a mechanic should diagnose the underlying problem rather than guessing at repairs, because repeated failed repairs waste money.

Do I have to test at the same station where I failed?

No. You can retest at any authorized testing station in Washoe County. Some people choose a different station if they want a second opinion, though the test procedure is standardized across all stations.

What if my vehicle is in the shop during my registration renewal?

Contact the Nevada DMV before your registration expires and explain the situation. You may be able to request a temporary extension to allow time for repairs and testing. The DMV handles these requests on a case-by-case basis.

Are there any vehicles that never need to be tested?

Yes. Vehicles manufactured before 1975, motorcycles, electric vehicles, and vehicles over 30 years old are exempt. Diesel vehicles follow a separate inspection process. Check the Nevada DMV website or call the Reno office to confirm your vehicle's status.