Wisconsin emissions test — seven counties, an OBDII scan, every other year.
Cars and light trucks customarily kept in Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington and Waukesha counties need an emissions test every other year before their plates can be renewed. It's an OBDII computer scan only; Wisconsin dropped tailpipe testing in July 2008. Buying a car, changing the owners on a title or moving to Wisconsin brings a 45-day deadline. WisDOT administers the program and the contractor Opus Inspections manages it, with private stations and two state centers whose kiosks run around the clock.
Buying a Used Car in Southeast Wisconsin?
You'll likely need a test within 45 days, and it covers emissions only. Enter the VIN for a free preview of title brands, salvage records and odometer readings.
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Quick Answer
- Which Wisconsin counties require emissions testing?
- Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington and Waukesha. What counts is where the vehicle is customarily kept, which you report when you title and register it. Cars kept elsewhere in Wisconsin aren't tested.
- Which vehicles need a Wisconsin emissions test?
- Vehicles with auto or light truck plates: model years 1996–2006 under 8,501 lb GVWR running on gasoline, natural gas or as a hybrid, and 2007 and newer up to 14,000 lb, diesels included. Model year 1995 and older are exempt.
- Do I need an emissions test after buying a car in Wisconsin?
- If it's kept in one of the seven counties and is a covered model year, WisDOT says a test may be needed within 45 days of buying and registering it. The same 45 days apply when an owner is added to or removed from the title, and to new residents.
Four steps to a Wisconsin emissions test
WisDOT tells you when a test is due; a plate search shows it too.
- 1Watch for the noticeRenewal notices go out at least a month before plates expire.
- 2Bring one documentThe renewal notice, registration, DMV letter or title.
- 3OBDII scanAt a private station, or a 24/7 kiosk for 2007+ vehicles.
- 4Renew the platesA required test has to pass before renewal.
How Wisconsin's Emissions Program Works
The Wisconsin Vehicle Inspection Program has run since 1984; Sheboygan County joined in July 1993, making today's seven-county area. It exists under the federal Clean Air Act to help those counties meet the ozone standard. WisDOT administers it, the contractor Opus Inspections manages it, and DNR shares responsibility for the air-quality side.
A vehicle is tested every other year, and the plates can't be renewed until a required test is done. WisDOT notifies owners when a test is due, and its online plate search, which asks only for the plate number, shows whether a test is required. The county where a vehicle is "kept" is recorded at titling and registration; giving a false location can bring a fine of up to $200, up to 6 months in jail, or both.
Which Vehicles Are Tested
From WisDOT's emissions testing page and the program changes EPA described in 2013 and 2026.
| Vehicle (kept in the seven counties) | Tested? |
|---|---|
| Model years 1996–2006, under 8,501 lb: gasoline, natural gas or hybrid | Yes |
| Model years 2007 and newer, up to 14,000 lb, diesel included | Yes |
| Model year 1995 and older cars and light trucks | No |
| Model year 2006 and older heavy trucks | No |
| Off-road utility, lightweight utility and low-speed vehicles | No |
| Newest vehicles | First tested at 4 model years old (as EPA described the rule in 2013) |
WisDOT's coverage list names vehicles with auto or light truck plates that run on gasoline, natural gas, hybrid power or (2007 and newer) diesel. It doesn't list electric vehicles or motorcycles.
Wisconsin Emissions Rules at a Glance
Counties, model years and deadlines on one card.
From WisDOT, DNR and the Federal Register, read on the date shown.
How the Test Works
From WisDOT and EPA's descriptions of the program.
OBDII scan only
Since July 2008, every vehicle is tested by reading its OBDII system.
No tailpipe or gas cap test
Idle tests ended in 2008; the separate gas cap test went with the 2012 revision.
One document
Renewal notice, registration, DMV letter, prior report, form MV2016 or the title.
24/7 kiosks
Self-service, for 2007 and newer vehicles.
Two state centers
8718 W Brown Deer Rd, Brown Deer and 9300 S 27th St., Oak Creek.
Private stations
Most tests are done at private testing facilities across the seven counties.
Buying a Car, Title Changes and New Residents
WisDOT lists three moments when a test may be due outside the usual two-year cycle, each with 45 days to get it done: when a vehicle is bought and registered, when an owner is added to or removed from the title, and when a new resident transfers a vehicle to Wisconsin. New residents get a letter from DMV if a test is required. Collector plates for model year 1996 and newer may need a test before they're issued.
Wisconsin accepts out-of-state emissions tests. If the vehicle is kept somewhere with OBDII testing, send the passing results to Opus or WisDOT by email, fax or mail; once they're processed, you can renew. If it's temporarily somewhere without testing, you can request a temporary exemption to renew the plate and test when it returns.
Before you buy
- 45 days: from buying and registering a covered car.
- No pass, no plates: renewal waits for a required test.
- A false garaging county: a fine of up to $200.
- Salvage title: repaired cars need a separate certified inspection.
An Emissions Pass Isn't a History
The OBDII scan checks today's emissions system. Enter the VIN for a free preview of the title brands, salvage records and odometer readings on file.
Failing, Waivers and Temporary Exemptions
After two failed or rejected tests in a row, or after a shop has made repairs between inspections, WisDOT tells owners to call Opus at 1-866-623-8378; it also points to Technical Assistance Centers. A waiver is possible: since the 2012 revision, the minimum repair spend in all seven counties is the federal amount, $450 in 1989 dollars adjusted for inflation. WisDOT's pages don't publish today's dollar figure.
To qualify on repair cost, the vehicle must pass a waiver emission equipment inspection, and federal rules require a failed retest after all qualifying repairs; warranty coverage must be used first, and repairs to tampered equipment don't count. A vehicle that can't be driven, or is temporarily somewhere without testing, can get a temporary exemption with form MV2472.
When You Don't Need a Test
From WisDOT, form MV2472 and the program changes EPA approved.
Kept outside the 7 counties
Only vehicles customarily kept in the seven counties are tested.
1995 and older
Exempt since the 2007–2009 state budget.
Older heavy trucks
2006 and older heavy trucks, and anything over 14,000 lb.
Off-road and low-speed
Off-road utility, lightweight utility and low-speed vehicles.
Not drivable
A temporary exemption with form MV2472, or by email to DMV.
Temporarily away
Where no OBDII testing exists: renew now, test on return.
The Ozone Fight and What Could Change
EPA reclassified the Kenosha, Sheboygan and Milwaukee ozone areas from moderate to serious in a notice published December 17, 2024, effective January 16, 2025. A federal appeals court stayed that on September 5, 2025, and on July 28, 2026 EPA agreed to reconsider it at Wisconsin's request. Governor Evers had asked EPA on June 30, 2026 to split the Milwaukee area in two. Separately, EPA approved the area's moderate-level plan, which includes the emissions program, on August 20, 2026, effective September 21, 2026.
The program rule, Wis. Admin. Code ch. Trans 131, was last revised effective August 1, 2023 and approved by EPA on October 29, 2024. Wisconsin Public Radio reported in May 2026 that Republican members of Congress from Wisconsin introduced a bill to let states seek redesignation when most of their ozone blows in from elsewhere, and that Rep. Tom Tiffany has called for ending emissions testing. Nothing has changed for drivers yet.
Does Wisconsin Inspect Cars for Safety?
Not routinely. The State Patrol's inspection services cover special categories: ambulances, buses and school buses, human service vehicles, homemade or reconstructed vehicles, farm vehicles and salvage titles. Ordinary cars only face the emissions test, and only in the seven counties.
The salvage rule matters to buyers: a repaired vehicle titled as salvage must be inspected by a certified salvage title inspector before it goes back on the road. A title check before you buy tells you whether that applies.
Related Checks and Guides
Emissions rules in other states, what an inspection costs, and checks to run before you buy.
Where These Facts Come From
WisDOT and DNR pages and the Federal Register. The program's own site and the Legislature's site weren't reachable when this page was written.
CarCheckerVIN is not affiliated with WisDOT, DNR or the Wisconsin Vehicle Inspection Program and does not test vehicles. Check WisDOT for the latest before you test. This page is general information, not legal advice.
Wisconsin Emissions Test — Frequently Asked Questions
What southeastern Wisconsin drivers and buyers ask most.
How much does a Wisconsin emissions test cost?+
WisDOT's emissions testing page and its list of vehicle fees don't name a charge for the test. Check with the Wisconsin Vehicle Inspection Program before you go.
How do I know if my car needs an emissions test?+
WisDOT sends a notice when a test is required, and its online license plate search shows whether one is due.
Do electric cars need an emissions test in Wisconsin?+
WisDOT's coverage list names gasoline, natural gas, hybrid and diesel vehicles; electric vehicles aren't on it.
Can I get my emissions test done in another state?+
Yes. Wisconsin accepts out-of-state emissions tests. Send the passing results to Opus or WisDOT, and you can renew once they're processed.
Can I use the kiosk for any car?+
No. The 24/7 self-service kiosks at the two state centers test only model year 2007 and newer vehicles.
Is Wisconsin ending emissions testing?+
Not as of this page's date. The ozone reclassification is under reconsideration and a federal bill has been introduced, but the program continues and EPA approved it again in August 2026.
Check the Car's History Too
Enter any 17-character VIN for a free preview. The full report lists title brands, NMVTIS junk and salvage records, insurance total-loss records, odometer readings, and auction records with the damage the auction recorded and its photos.
CarCheckerVIN is an independent vehicle-history service and is not affiliated with WisDOT, the Wisconsin DNR or Opus Inspections. This guide summarizes their publications and the Federal Register, read on 24 October 2026; it is not legal advice. Records in our reports reflect what was reported to our data providers. Our reports do not include police or repair-shop accident entries.
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