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The Ohio ECheck Program

In January 1996, the State of Ohio began a new vehicle emissions testing program, E-Check, designed to identify motor vehicles that emit excessive levels of pollutants into the air. Among the other emissions control options considered by the legislature, E-Check was the most cost-efficient measure to reduce the volatile organic compounds (VOCs) that form ground-level ozone, or smog. The program currently tests cars in seven Ohio counties.

At the time it was implemented, E-Check used the I/M 240 test, a 240-second transient test during which a vehicle is driven on a dyne (treadmill) and its tailpipe emissions are measured. In 2000, the I/M 240 test was replaced with Acceleration Simulation Mode (ASM) 2525. ASM 2525 is similar to I/M 240 but is perceived to be less stressful on the vehicle. Testing programs, like E-Check, that employ one or more of these tests are referred to by U.S. EPA as "enhanced" programs.

In January 2004, a new, federally mandated test known as On-Board Diagnostics (OBD II) was implemented. OBD II is required for newer vehicles, while ASM 2525 is still used for older vehicles. For more information on OBD II click here.


  Laws and Rules that Govern the E-Check Program



Federal Requirements:

Plain English Guide to the Clean Air Act

Clean Air Act

Enhanced I/M Program Requirements

Title 40 CFR Part 51 Section 351

Motorist Compliance Requirements

Title 40 CFR Part 51 Section 361

State Requirements:

Legal Requirements

Ohio Revised Code (3704.14)


Ohio Administrative Code (3745.26)




  Other Resources



United States Code


Code of Federal Regulations


Federal Register Home Page



Ohio Administrative and Revised Code


Register of Ohio


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