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Emission Testing

Emission Testing Information
The type of emission test for your vehicle is determined by your location and the age of the vehicle.  The information below outlines the criteria, and provides a link to detailed information about the specific emission tests.

El Paso, Travis and Williamson County Motorists
1995 and older vehicles will receive the Two Speed Idle (TSI) test while 1996 and newer vehicles receive the On-Board Diagnostic (OBDII) test.

DFW and Houston/Galveston Area Motorists
1995 and older vehicles will receive the Accelerated Simulation Mode (ASM) test, while 1996 and newer vehicles receive the On-Board Diagnostic (OBDII) test.

The owner of a vehicle may obtain for that vehicle an exemption from the vehicle emissions test requirements if that vehicle meets certain criteria. For more information, see Emissions Testing Exemptions