Texas emissions testing requirements apply to gasoline-powered vehicles between 2 and 24 years old that are registered in 17 designated counties across the Dallas–Fort Worth, Houston, Austin, and El Paso metro areas, with Bexar County joining in 2026. If your vehicle falls in that group, you need to pass an annual emissions test before you can renew your registration. The 2025 repeal of Texas safety inspections for non-commercial vehicles did not touch this requirement.1Department of Public Safety. ICYMI: Vehicle Safety Inspection Changes Take Effect January 2025
Counties Where Emissions Testing Is Required
Emissions testing is a metro-area program, not a statewide one. If your vehicle is registered outside these counties, you do not need an emissions test.
- Dallas–Fort Worth: Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, and Tarrant
- Houston–Galveston–Brazoria: Brazoria, Fort Bend, Galveston, Harris, and Montgomery
- Austin: Travis and Williamson
- El Paso: El Paso
Bexar County (San Antonio) is being added to the program in 2026, so drivers there should plan for the new requirement.1Department of Public Safety. ICYMI: Vehicle Safety Inspection Changes Take Effect January 2025 These designations exist because the affected metros have to meet federal ozone standards under the Clean Air Act.2Texas Commission on Environmental Quality. Vehicle Emissions Inspections in Texas
Which Vehicles Have To Test
Inside those counties, the rule covers gasoline-powered vehicles that are between 2 and 24 years old. A brand-new car gets its first two years free, and a vehicle ages out of the program once it turns 25.3Legal Information Institute. 30 Texas Administrative Code 114.50 – Vehicle Emissions Inspection Requirements
A number of vehicles are exempt regardless of county:
- Electric vehicles
- Diesel-powered vehicles
- Motorcycles and mopeds
- Military tactical vehicles
- Dual-fuel vehicles that cannot run on gasoline
- Antique vehicles registered with the Texas Department of Motor Vehicles under antique plates3Legal Information Institute. 30 Texas Administrative Code 114.50 – Vehicle Emissions Inspection Requirements
Hybrids are not exempt. If the car burns gasoline and fits the age window, it needs the test.
What the Test Actually Involves
For almost every vehicle you’ll see on the road today, the test is an OBDII scan. The technician plugs a tool into your car’s diagnostic port and reads emissions-related data from the onboard computer.4Department of Public Safety. Emissions Testing
Two things will fail an OBDII test automatically. The first is an illuminated check engine light: if it’s on, the vehicle fails. The second is incomplete readiness monitors, which are the self-checks the car’s computer runs during normal driving. For 2001 and newer vehicles, only one monitor can be incomplete and still pass. For 1996–2000 models, two are allowed.4Department of Public Safety. Emissions Testing Monitors reset when the battery is disconnected or the codes are cleared, so if either happened recently, drive the car normally for several days before testing.
Vehicles built before 1996 don’t have OBDII and get a tailpipe measurement instead. Most counties use the Acceleration Simulation Mode (ASM-2) test on a dynamometer; El Paso, Travis, and Williamson counties use the Two-Speed Idle test.3Legal Information Institute. 30 Texas Administrative Code 114.50 – Vehicle Emissions Inspection Requirements Few drivers will run into this — those vehicles are now over 30 years old.
Prices are set by individual stations rather than statewide, so rates can vary from shop to shop. Calling ahead can save you a few dollars.
When To Test
Testing is annual and tied directly to your registration renewal. Under the “Two Steps, One Sticker” system, a passing emissions test has to be on file before the county tax assessor-collector will renew your registration.2Texas Commission on Environmental Quality. Vehicle Emissions Inspections in Texas
The test must be no more than 90 days old when you renew. A test done four months early won’t count. A reasonable window is one to two months before your sticker expires, which leaves time for repairs if the car doesn’t pass on the first try.
If Your Vehicle Fails
A failed test blocks your registration renewal until you fix the underlying problem. The inspection report lists the exact trouble codes or measurements that caused the failure, which is the information a repair shop needs to diagnose the issue.
You get one free retest, but there are two conditions: it has to happen within 15 days of the original test, and it has to be at the same inspection station. Miss the window or go somewhere else and you pay the full fee again.5Department of Public Safety. General Inspection
Save every repair receipt. You’ll need documentation both for the retest and for a possible waiver.
Waivers and Extensions When You Can’t Pass
Some vehicles won’t pass even after reasonable repair effort. Texas has several options for that situation, all handled through DPS waiver/challenge stations.
Low Mileage Waiver
If you drive fewer than 5,000 miles a year, you may qualify. You must have failed both the initial test and the free retest, spent at least $100 on emissions-related repairs, and be able to show the vehicle stayed under 5,000 miles since its last inspection and will likely stay under before the next one.6Department of Public Safety. Waivers and Time Extensions
Individual Vehicle Waiver
Available once you’ve spent at least $600 on qualified emissions-related repairs, or $450 in El Paso County. You must have failed both the initial test and the retest, and you can’t qualify for another waiver type.7Legal Information Institute. 37 Texas Administrative Code 23.52 – Emissions Testing Waiver
Low-Income Time Extension
If your annual income is below the national poverty level, you can apply for a one-year extension of the compliance deadline. This one can be granted more than once over a vehicle’s lifetime.8Texas Commission on Environmental Quality. Affidavit, Waivers and Extensions, and the Vehicle Inspection Report
Parts Availability Time Extension
If your vehicle fails because a needed repair part isn’t readily available, you can request a time extension until you can get the part. Less common, but useful for older or unusual vehicles.8Texas Commission on Environmental Quality. Affidavit, Waivers and Extensions, and the Vehicle Inspection Report
How To Apply
Every waiver and extension requires an in-person visit to a DPS waiver/challenge station. Bring your failed inspection report, the VIE-7 Vehicle Repair Form you received when the car failed, and all repair receipts. Station locations are listed by county on the DPS website.6Department of Public Safety. Waivers and Time Extensions
What Happens If You Skip It
Without a passing test, you cannot renew registration. Driving on expired registration is a misdemeanor and a simple reason for a traffic stop. The vehicle can also be flagged in the state’s Vehicle Emissions Enforcement System, which shares noncompliance data between TCEQ and DPS.9Legal Information Institute. 43 Texas Administrative Code 217.47 – Vehicle Emissions Enforcement System
If your car fails and repairs aren’t immediately affordable, apply for a waiver or extension. That’s what those programs are for, and it’s a better position to be in than driving on expired plates.