Seventeen Texas counties currently require vehicle emissions testing, and Bexar County is scheduled to join them in November 2026, bringing the total to eighteen. The counties that require emissions testing in Texas cluster around four metro areas: Dallas–Fort Worth, Houston, Austin, and El Paso. If your vehicle is registered in one of them, you cannot renew your registration without a passing emissions test.
The Counties That Require Testing Today
Texas groups its emissions counties by region, based on where ozone pollution has exceeded federal limits.1Texas Administrative Code. 30 Tex. Admin. Code 114.2 – Inspection and Maintenance Definitions
Dallas–Fort Worth (9 Counties)
Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, and Tarrant.1Texas Administrative Code. 30 Tex. Admin. Code 114.2 – Inspection and Maintenance Definitions This is the largest testing region in the state.
Houston–Galveston–Brazoria (5 Counties)
Brazoria, Fort Bend, Galveston, Harris, and Montgomery.1Texas Administrative Code. 30 Tex. Admin. Code 114.2 – Inspection and Maintenance Definitions
Austin–Round Rock (2 Counties)
Travis and Williamson. These two operate under a separate framework called the Early Action Compact, which brought them into emissions testing before they were formally designated as nonattainment areas.2Environmental Protection Agency. Texas SIP 30 TAC 114.80-114.87 Early Action Compact Counties The vehicle rules are the same as everywhere else.
El Paso (1 County)
El Paso is the only testing jurisdiction in West Texas.1Texas Administrative Code. 30 Tex. Admin. Code 114.2 – Inspection and Maintenance Definitions
The other 236 Texas counties have air quality clean enough that federal rules don’t require emissions testing there.
Bexar County Starts Testing in November 2026
San Antonio drivers should plan ahead. Starting in November 2026, vehicles registered in Bexar County will need a passing emissions test before registration renewal.3Department of Public Safety. Vehicle Safety Inspection Changes Take Effect January 2025 Vehicles that fail will reportedly get roughly 15 days to complete repairs and retest.
Does Your Vehicle Even Need the Test?
Living in a designated county doesn’t automatically mean your car is in the program. Three factors decide it: fuel type, age, and weight.
- Gasoline-powered only. Diesel vehicles are excluded.4United States Environmental Protection Agency. Texas SIP 30 TAC 114.50 Vehicle Emissions Inspection Requirements
- Between 2 and 24 model years old. Testing begins at the vehicle’s second anniversary and ends after year 24.5Texas Commission on Environmental Quality. Vehicle Emissions Inspections in Texas
- Gross vehicle weight of 8,500 pounds or less. The test uses the OBDII diagnostic system, which heavier gasoline vehicles aren’t equipped with.6Texas Department of Public Safety. Vehicle Inspection Operations and Training Manual for Official Vehicle Inspection Stations
The weight threshold covers most cars, SUVs, and light-duty pickups. Some heavy-duty pickups and full-size vans fall above it.
Vehicles That Skip Emissions Testing
Several categories are exempt even in a designated county:
- Diesel vehicles.4United States Environmental Protection Agency. Texas SIP 30 TAC 114.50 Vehicle Emissions Inspection Requirements
- Motorcycles.
- Fully electric vehicles. With no combustion engine, Texas law exempts them from all exhaust and emissions requirements.7State of Texas. Texas Transportation Code TRANSP 548.051
- Antique vehicles registered as such with the Texas DMV. Antique plates restrict use to exhibitions, parades, and similar activities.
- Brand-new vehicles from the current or preceding model year.
- Military tactical vehicles and dual-fuel vehicles that cannot run on gasoline.
Military personnel temporarily stationed in Texas can keep their home-state registration and avoid the program entirely. But if the vehicle is registered in Texas in one of the 17 designated counties, a passing emissions test is still required regardless of military status.8Texas Department of Motor Vehicles. For Our Troops
Safety Inspections Ended, but Emissions Did Not
On January 1, 2025, Texas eliminated mandatory safety inspections for non-commercial vehicles under House Bill 3297. Personal cars and light trucks no longer go in for brake, tire, or lighting checks. Instead, owners pay a $7.50 inspection program replacement fee at registration. New vehicles that haven’t been previously registered pay $16.75 to cover two years.9Department of Public Safety. Vehicle Safety Inspection Program Changes Now in Effect
Emissions testing survived the repeal untouched. If your vehicle is in one of the designated counties and meets the fuel, age, and weight criteria, you still visit an authorized station before registration renewal.3Department of Public Safety. Vehicle Safety Inspection Changes Take Effect January 2025 Commercial vehicles still require full safety inspections statewide.
What the Test Involves
The technician plugs a scan tool into the diagnostic link connector under your dashboard. The tool reads your OBDII computer and checks whether the emissions-related monitors show a “ready” status.6Texas Department of Public Safety. Vehicle Inspection Operations and Training Manual for Official Vehicle Inspection Stations If your battery was recently disconnected or codes were cleared, those monitors may read “not ready,” and the test can’t be completed.
There’s also a visual check. The technician confirms the catalytic converter is present and that factory emissions equipment hasn’t been removed or tampered with.10Department of Public Safety. Inspection Criteria for Emission Inspection A missing catalytic converter is an automatic failure.
Results transmit electronically to the state. The Texas DMV pulls them when you renew; you don’t carry a paper certificate.
What It Costs
Testing fees vary by county and vehicle type, and DPS does not publish a single statewide schedule.9Department of Public Safety. Vehicle Safety Inspection Program Changes Now in Effect On top of the test fee, every non-commercial owner pays the $7.50 inspection program replacement fee at registration. The station keeps its fee whether you pass or fail, so fixing known problems first saves money.
You’ll need proof of insurance before the station will perform the test. A liability policy, standard proof-of-insurance form, insurance binder, or DPS self-insurance certificate all qualify.11Texas Department of Public Safety. Vehicle Inspection Station Rules – Financial Responsibility Annex
If Your Vehicle Fails
A check engine light is the most common cause of an OBDII failure. Address it first; clearing codes without fixing the underlying problem won’t work, because the monitors will either re-flag the issue or come back as “not ready.” If monitors show “not ready,” you need to drive a specific pattern (a drive cycle) to reset them. The pattern varies by manufacturer, and a dealership or qualified mechanic can tell you what yours requires. One “not ready” monitor is allowed on 2001 and newer vehicles; two or more means failure.12Department of Public Safety. Ready or Not
If you’ve spent real money on repairs and still can’t pass, you can apply to DPS for an individual vehicle waiver. The minimum repair expenditure is $600 in most affected counties and $450 in El Paso County.13Cornell Law Institute. 37 Tex. Admin. Code 23.52 – Emissions Testing Waiver The waiver lasts one year and lets you register the vehicle while you keep working on it. A low-mileage waiver is also available for vehicles with at least $100 in emissions repairs that meet mileage criteria.14Department of Public Safety. Waivers and Time Extensions The former AirCheckTexas repair assistance program has ended, so waivers through DPS are now the main option for vehicles that cannot pass.15Texas Commission on Environmental Quality. AirCheckTexas Drive a Clean Machine Vehicle Repair Assistance