Nevada Smog Check Guide: Who Needs One and When

Nevada runs its emissions program through the Department of Motor Vehicles, and the rules are narrower than most people assume. Only two counties test, the exemptions are generous for new cars, and the result goes to the DMV electronically so you can renew online the same day. This guide follows the DMV's Emission Control Program page and NRS 445B so you know exactly where you stand before you drive into one of our Reno service centers.

At a glance

• Testing areas: Reno, Sparks, Washoe Valley and the rest of urban Washoe County, plus the Clark County urban area. Carson City, Douglas, Lyon and Storey counties do not test.
• Exempt: the first three registrations of a new vehicle, hybrids for five model years, 1967 and older, electric vehicles, motorcycles.
• A passing test is valid for 90 days (180 days for a Nevada dealer sale).
• Fees are capped by the DMV each year; stations set their own price up to the cap.

Where in Nevada a smog check is required

The DMV program covers two areas. In Washoe County it is Reno, Sparks, Washoe Valley, most of the area west of Washoe Valley and everything in the county south of the 40th parallel. Incline Village, Crystal Bay, Sutcliffe, Nixon and Wadsworth are exempt. In Clark County it is the urban valley plus a five-mile buffer. That is the whole list.

Carson City, Douglas County (Minden, Gardnerville, the Ranchos, Genoa), Lyon County (Dayton, Mound House, Fernley) and Storey County (Virginia City) are not emissions areas. A vehicle registered at an address in those places never needs a smog check to renew. The question that trips people up is which address the registration carries: a Dayton resident who kept a Reno address on the registration is still in the testing program until the DMV record moves.

Which vehicles test, and which are exempt

Inside the testing areas, gasoline vehicles of model year 1968 and newer test at every renewal regardless of weight, and diesel vehicles test up to 14,000 pounds GVWR. The DMV page lists the exemptions: a new vehicle is exempt for its first three registrations and tests on the fourth; a hybrid is exempt for its first five model years and tests from the sixth; 1967 and older vehicles, motorcycles and mopeds, electric vehicles, and vehicles running permanently on propane, natural gas, methane or butane are exempt; diesels over 14,000 pounds GVWR are exempt.

Classic Vehicle, Classic Rod and Old Timer plates are exempt when the car is driven 5,000 miles a year or less, carries classic insurance and the owner files the yearly odometer affidavit. Certain transfers, such as between spouses, do not trigger a new test under NRS 445B.800.

What the test checks

For 1996 and newer vehicles the test is an on-board diagnostics check. The inspector plugs into the OBD-II port, reads the readiness monitors and any stored trouble codes, confirms the check engine lamp is off and that the lamp works, and does a visual check for emissions equipment. Older vehicles get a tailpipe test instead. If the computer has recently been cleared, by a repair or a battery disconnect, the monitors may read incomplete and the DMV page says the result comes back Rejected rather than failed. That is not a failure; the car needs a week or so of mixed driving so the monitors can finish, then a retest. The check engine light guide covers that case.

The 90-day rule and how renewal flows

If you try to renew online before the test is in the system, the site will block the renewal and tell you a smog check is required. Do the test first.

1. Watch for the DMV renewal notice, which arrives about 35 days before the registration expires, or set your MyDMV account to email reminders.
2. Get the smog check inside the 90-day window before you renew. A pass is valid 90 days, or 180 days when a Nevada dealer sold the vehicle.
3. The station transmits the result to the DMV electronically. Nothing to carry in.
4. Renew online, at a DMV kiosk, or by mail. Online renewal opens about 35 days before expiry and stays open 18 months after, per the DMV renewal page.
5. Keep the registration card and put the new decal on the plate when it arrives.

What a smog check costs in Washoe County

Fees are capped, not fixed. The DMV sets a yearly maximum from a labor-rate survey, and each station chooses its own price up to that maximum. For 2026 the DMV page lists the Washoe light-duty gasoline inspection maximum at $64.50 plus a $7 DMV certificate fee, with heavy-duty gasoline at $66 and diesel at $67 before the certificate. The smog check cost page keeps those published figures current. Ask when you pull in for our price for your vehicle.

Smog checks at our service centers

Our two Reno service centers, Mae Anne Avenue in northwest Reno and Longley Lane in south Reno, run smog checks alongside oil changes so you can handle both in one drive-in visit. No appointment, stay for the service, and the result is sent to the DMV before you leave. A Washoe-registered car is served at either Reno service center.

Before a test we suggest a quick look at the basics: no check engine light, a recent oil change if one is due, a gas cap that clicks, and at least a short highway drive to warm everything up. Our pre-test checklist walks through it. Drive into Mae Anne or Longley today and leave with the test done and the oil fresh.