Highlights of the Vehicle I/M Program

Brief description by area of the inspection and maintenance (I/M) program in Texas

Subject Vehicles: Gasoline vehicles model-year 2-24 years old are required to have an annual emissions inspection beginning with the vehicle's second anniversary.
Inspection Method: Model-year 1996 and newer vehicles are subject to on-board diagnostics (OBD) inspections and model-year 1995 and older vehicles are subject to two speed idle (TSI) inspections.
Inspection Fees: Not to exceed $16.00 for a TSI or OBD inspection, plus $12.75 for the safety inspection, total not to exceed $28.75.
State Administration Fees: $2.50 from all emissions inspections for the TCEQ/DPS administration of the I/M program and $2.00 to fund the Drive A Clean Machine program, which provides financial assistance to qualified motorists needing repairs to or retirement of vehicles that failed emissions inspections.
Timing: OBD/TSI inspections began on September 1, 2005, in Travis and Williamson Counties.
Testing Network: All inspection stations are required to offer TSI and OBD inspections.
Waivers: Waivers and time extensions are available for eligible vehicle owners.

Subject Vehicles: Gasoline vehicles model-year 2-24 years old are required to have an annual emissions inspection beginning with the vehicle's second anniversary.
Inspection Method: Model-year 1996 and newer vehicles are subject to OBD inspections and model-year 1995 and older vehicles are subject to acceleration simulation mode (ASM) inspections.
Inspection Fees: Not to exceed $27.00 for an ASM or OBD inspection, plus $12.75 for the safety inspection, total not to exceed $39.75.
State Administration Fees: $2.50 from all emissions inspections for the TCEQ/DPS administration of the I/M program and $6.00 from all OBD inspections to fund the Drive A Clean Machine program, which provides financial assistance to qualified motorists needing repairs to or retirement of vehicles that failed emissions inspections.
Timing:
- May 1, 2002: ASM/OBD inspections began in Collin, Dallas, Denton, Harris, and Tarrant Counties.
- May 1, 2003: ASM/OBD inspections began in Brazoria, Ellis, Fort Bend, Galveston, Johnson, Kaufman, Montgomery, Parker, and Rockwall Counties.
Testing Network: All inspection stations offer ASM and OBD inspections, unless the station is approved to be a low volume OBD-only station by the DPS.
Waivers: Waivers and time extensions are available for eligible vehicle owners.

Subject Vehicles: Gasoline vehicles model-year 2-24 years old are subject to annual emissions inspection beginning with the vehicle's second anniversary.
Inspection Method: Model-year 1996 and newer vehicles are subject to OBD inspections and model-year 1995 and older vehicles are subject to TSI inspections.
Inspection Fees: not to exceed $14.00 for a TSI or OBD emission inspection, plus $12.75 for a safety test, total not to exceed $26.75.
State Administration Fee: $2.50 from all emissions inspections for the TCEQ/DPS administration of the I/M program
Timing: OBD/TSI began on January 1, 2007, in El Paso County.
Testing Network: All inspection stations are required to offer TSI and OBD inspections.
Waivers: Waivers and time extensions are available for eligible vehicle owners.