Failed Vehicle Emissions

Emissions Repair

If your vehicle failed its emissions test, we can diagnose and repair the problem as part of our comprehensive automotive repair services.

Vehicles registered in Lake and Porter counties are required to undergo emissions tests and tampering inspections every two years if they were manufactured after 1975 and have a gross vehicle weight rating (GVWR) of 9,000 pounds or less. Vehicle manufacturers typically print the GVWR on the driver-side door jamb.

vehicle emissions testing
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Lansing, IL: (708) 418-5000
Hobart, IN: (219) 759-0233
Crown Point, IN: (219) 663-1847

Lansing, IL: (708) 418-5000
Hobart, IN: (219) 759-0233
Crown Point, IN: (219) 663-1847

Vehicles manufactured in odd-numbered years are tested during odd-numbered years and vehicles manufactured in even-numbered years are tested during even-numbered years. Exemptions include vehicles manufactured during the four latest model years and antique vehicles (as defined by 326 IAC 13-1.1-1 - see Section 1 on page 2).  For instance, a vehicle with a manufacturer's model year of 2009 should be tested in 2013, and tested again in 2015 and 2017.

Bring your Indiana Vehicle Registration Renewal notice or your current registration with you.

If your vehicle is driven by a college student who is away at school or if the vehicle is kept in another state for part of the year, early testing is recommended. Vehicles can be tested as early as October of the year before they are due.

About Emissions Testing

All vehicles receive a Gas Cap Pressure Check, which tests to see if a vehicle’s gas cap is effectively keeping fuel vapors from escaping. Fuel evaporation is a major cause of ground level smog and a properly functioning gas cap improves gas mileage by preventing fuel waste.

The Second Generation On-Board Diagnostics (OBD II) Test is the most common test procedure and is used to test model year 1996 or newer vehicles. During this simple test, data is downloaded from the vehicle’s on-board computer to check for emissions equipment malfunctions. An OBD scanner is attached to a connector typically located under the vehicle’s dashboard.

The Inspection and Maintenance (I/M 93) Test is used to test model year 1981 through 1995 vehicles. During this test, an inspector drives the vehicle on a treadmill-like device called a dynamometer. The test simulates driving on a road. While driving, the vehicle’s tailpipe emissions are captured and analyzed to determine if the emissions control equipment is working properly. It is important that a vehicle subject to this type of test has an exhaust system that is intact and leak free. The vehicle also needs properly functioning brakes and should not have any major fluid leaks.

The Single Idle Speed (BAR 90) Test is used to test 1976 to 1980 model year vehicles. A metal probe is inserted into the vehicle’s tailpipe while the vehicle idles to sample the exhaust stream. At the same time, a sensor is placed on the hood of the vehicle to measure the engine speed. The probe measures the vehicle’s emissions and they are analyzed to determine whether or not the vehicle’s emission control equipment is working properly. The vehicle’s exhaust system must be intact and leak free.


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