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Vehicle Inspection and Maintenance (I/M) Program

Information and links to documents about the vehicle I/M program under the State Implementation Plan (SIP) for air quality.

The SIP files on this page are hosted by the Texas Records and Information Locator (TRAIL) web archive . If you need assistance with a file, please contact


Areas affected: HGB, DFW, ELP, ARR

End date: None

Applicability period: Year-round

Source type: On-road mobile source

Emissions targeted: Nitrogen oxides (NOX), volatile organic compounds (VOC), carbon monoxide (CO)

Rule/Citation: 30 Texas Administrative Code (TAC) 114, Subchapter C ( PDF )(HTML )
Description: Texas first established a vehicle emissions testing program on January 1, 1995, meeting the U.S. Environmental Protection Agency's requirements for I/M programs. The I/M program has been implemented in 15 counties in the Dallas-Fort Worth, Houston-Galveston-Brazoria, and El Paso nonattainment areas, and in Travis and Williamson Counties in the Austin-Round Rock area.

The I/M program requires the annual inspection of gasoline-powered vehicles 2–24 years old in the affected counties. Vehicles must be inspected through Department of Public Safety–certified inspection stations for emissions of NOX, VOC, and CO.

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Recent Activities

On November 29, 2023, the commission adopted revisions to 30 Texas Administrative Code (TAC) Chapter 114, Control of Air Pollution from Motor Vehicles, and to the Texas I/M SIP implementing a new I/M program in Bexar County that will start on November 1, 2026. The rule and SIP revisions require all vehicle emissions inspection stations in Bexar County to offer On-Board Diagnostics (OBD) tests and set a maximum fee of $18.50 for a vehicle emissions inspection conducted in Bexar County. The rule and SIP revisions maintained the current I/M program requirements for other areas.

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SIP Narratives and Related Rules

These files are available in PDF (PDF Help) and WordPerfect (Help with Downloading Files).

Rule/Citation: 30 TAC 114, Subchapter C ( PDF )(HTML )

I/M SIP 2022 (Project No. 2202-026-114-AI)

I/M SIP 2013 (Project No. 2013-035-114-AI)

I/M SIP 2009 (Project No. 2009-027-114-EN)

I/M SIP 2005 (Project No. 2005-026-114-EN)

Austin EAC SIP (Project No. 2009-027-114-EN)

I/M SIP 2004

I/M SIP Oct 2003

I/M SIP Dec 2002

I/M SIP Oct 2001

HGB I/M SIP Dec 2000

I/M SIP Apr 2000

Adopted I/M SIP June 1998, Project No. 1998-004-SIP (06/03/98)

Adopted I/M SIP May 1997, Project No. 97119-SIP-AI (05/14/97)

Proposed I/M SIP May 1997, Project No. 97119-SIP-AI (03/05/97)

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Useful Link

Texas Department of Public Safety Vehicle Inspection

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Contact Us

David Serrins
Air Quality Division, TCEQ
Phone: 512/239-1954

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