Canyon County


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Emissions Testing
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In April 2008, the Idaho Legislature enacted and the governor signed into law Idaho Code §39-116B, entitled the Vehicle Inspection and Maintenance Program, laying the groundwork for requiring vehicle emissions testing in areas of the state where air quality is compromised and motor vehicle emissions constitute one of the top two contributing sources to the pollution. The Treasure Valley airshed meets the criteria specified in the law, as data show that vehicle emissions constitute one of the top two emission sources contributing to ozone concentrations in the valley.

A completed emissions test will cost  $11.00.  Vehicles need to be emission inspected every other year.  Motorists will receive a notice in the mail when it is time to have their vehicle emissions inspected.

How and Where

The Canyon County program is managed by Applus Technologies.

Applus Technologies Inc.
2216 Cortland Place
 Nampa, Idaho 83687
(208) 461-1232

Emissions testing is available at more than 20 conveniently located businesses throughout Canyon County and Kuna. For specific testing locations, visit  Tests performed outside of Canyon County are also accepted. Applus and the Ada County’s Air Quality Board exchange test results on a daily basis.

Motorists may have an opportunity to request an extension or exemption from the emission inspections requirements according to the program rules. Required forms can be found at

Notification of Emissions Test and Deadline

There is no need to obtain an inspection before the notice is received.

Motorists are sent two notifications about their requirement to test. Notices are sent to the address on file with the Idaho Transportation Department (ITD). To ensure notices are received, motorists should make sure their address is up to date with the DMV.

The first notice will detail which vehicle needs testing and options to complete the test. Motorists will have until the end of the designated month to complete the test.

If necessary, the second notice will be sent at the end of the 30-day testing period reminding the motorist that he or she failed to complete the test and if the test is not completed within 35 days from the date of the notice, vehicle registration will be subject to revocation by ITD.  We do not want to see this happen to any motorist, so please ensure you test your vehicle.

Re-Registering a Vehicle that has had the Registration Revoked

If a motorist fails to complete the test within the allotted time and fails to receive an approved waiver, exemption, or extension, ITD will revoke the vehicle's registration.

After revocation, if the motorist completes a passing emissions test or receives an approved waiver, exemption, or extension within that testing cycle, the registration will be reinstated automatically at no additional cost to the motorist.

If the registration is revoked and expired, the motorist must complete a passing emissions test or receive an approved waiver, exemption, or extension in order to purchase a new or renew a registration.

About the Test

Two types of testing methods are used to test gasoline-powered vehicles covered under the program. The type of test required is determined by the age of the vehicle.

Two-Speed Idle (TSI): Samples a vehicle’s exhaust for appropriate levels of volatile hydrocarbons, carbon monoxide, and carbon monoxide plus carbon dioxide.
On-Board Diagnostic (OBD): Uses an analyzer connected to the vehicle’s powertrain control module to look for broken or malfunctioning emission control components. 

Diesel vehicles covered under the program are tested by the OBD method or a snap acceleration test using a smoke meter at the end of the exhaust pipe.

A visual inspection of the emission control components is conducted on all vehicles inspected.

When a Vehicle Fails the Emissions Test

Vehicles not passing the inspection will receive a vehicle inspection report with the reasons the vehicle failed. Motorists are free to select a qualified repair technician or repair the vehicles themselves. See Possible Causes for Emission Test Failure below for more information.
After appropriate repairs are made, a motorist is allowed one free retest if completed within 30 days of the previous test and at the same station. Vehicles subject to emissions inspection must pass the test before the deadline indicated in the official notice.  Not passing the test by the deadline will result in the vehicle's registration being revoked.

When a vehicle fails, appropriate repairs should be completed and the vehicle retest.  If the vehicle does not pass the retest, a repair waiver may be granted if a minimum of $200 has been spent toward failure-related repairs.  Repairs for certain vehicles may be under warranty. Visit for waiver forms.

Motorists who want to dispute their test results may be able to obtain a free diagnostic and confirmation testing from Applus Technologies. This free service will be offered by appointment only.  Please see Applus’ contact information earlier on this web page.  Applus will not repair a vehicle.

Hardship Waiver

If a vehicle fails the test, a hardship waiver may be granted if the owner is not financially able to make the necessary repairs to bring the vehicle into compliance with emissions standards. Eligibility will be determined by comparing income to the current published poverty threshold as defined by the US Department of Health and Human Services and evaluating any additional extenuating circumstances.  Visit for waiver forms. The motorist will also be asked to provide the failed test report.

Proof of hardship is documented by the last 2 years of household federal tax returns or, if no tax returns are available, all household bills and paystubs for the past 2 months.

Other documentation that may identify extenuating circumstances might include medical bills not covered by insurance, loss of unemployment benefits, etc.

Vehicles Requiring Emissions Testing

  • Model year 1981–1995 gas-powered vehicles, using the TSI method

  • Model year 1996 and newer gas-powered vehicles more than 5 years old, using the OBD method

  • Model year 1981–1997 diesel-powered vehicles, using the snap acceleration method

  • Model year 2008 and newer diesel-powered vehicles more than 5 years old, using the OBD method

Vehicles Exempt from Testing

  • Electric or hybrid motor vehicles

  • Motor vehicles with a model year less than 5 years old

  • Motor vehicles with a model year older than 1981

  • Classic automobiles as defined by Idaho Code

  • Motor vehicles with a maximum vehicle gross weight of less than 1,500 pounds

  • Motor vehicles registered as motor homes as defined by Idaho Code

  • Motorized farm equipment

  • Registered motor vehicles engaged solely in the business of agriculture

  • Visit for exemption and waiver forms.

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1115 Albany St. Caldwell, Idaho 83605 | Phone: (208) 454-7300