Which vehicles are required to have the emissions test?
- Vehicles registered in the affected counties. Affected counties include: Brazoria, Collin, Dallas, Denton, El Paso, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Montgomery, Parker, Rockwall, Tarrant, Travis, and Williamson.
- Bexar County will an emissions county starting November 1, 2026.
- All gasoline powered vehicles from 2 through 24 years old which are registered or primarily operated in emissions counties will receive the On-Board Diagnostic (OBDII) test.
Emissions Inspection Items
| Insurance | Catalytic Converter |
| Exhaust Gas Recirculation (EGR) System | Evaporative Emissions Control System |
| Exhaust System | Evaporative Emissions Control System (gas cap and canister) |
| Air Injection System (AIS) | Positive Crankcase Ventilation (PCV) System |
Which vehicles are exempt from an emissions inspection test?
Gasoline powered vehicles on the exempt vehicle list and all vehicles powered by other means are exempt from emission inspection
Equipment:
- Road-Building Equipment
- Farm Machinery
- Trailers
- Semitrailers
- Pole Trailers
- Mobile Homes
- Any Vehicle required to Display a Slow-Moving Vehicle Emblem
When the actual gross weight or registered gross weight is 4,500 pounds or less.
A vehicle with one of the following type Texas license plates:
- Paper Dealer Demonstration/In-transit/Converter Tag
- Parade License
- Former Military Vehicle License
- In-Transit License
- Machinery License
- Disaster License
- Farm Trailer License
- Permit License
- Antique License
- Charitable Organization Tag
- All-Terrain Vehicle Validation Sticker
A vehicle with one of the following Texas permits:
- Factory Delivery Permits
- Prorate Tabs
- One-Trip Permits
- Temporary 24-Hour Permits
- Mobile drilling and servicing equipment used in gas, oil, or crude production having a 72- or 144-Hour Permit.