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On-Board Diagnostic Inspections

Since July 2001, the WIVIP conducts an OBD test on 1996 and newer vehicles equipped with OBD systems. The test consists of a plug that connects to the vehicle's computer and downloads emission system information. The test does not change or affect the vehicle's computer in any way. The test equipment only reads emission information from the vehicle's OBD system.

Testing Process

1. An inspector guides the vehicle into the inspection lane, enters the vehicle identification into the computer. Customers go to an enclosed waiting area from which they can observe the inspection.

2. The inspector observes if the vehicle's check engine light illuminates during a Key On Engine Off test.

3. The inspector then connects to the vehicle's OBD system. The connection is found within arms length of your vehicle's steering wheel. The testing equipment attempts to communicate with your vehicle's OBD system.

4. If communication is established, the equipment checks whether the vehicle's OBD system is ready for testing. A series of monitors must be set within your vehicle's OBD system for the test to continue.

5. If the monitors were set, your vehicle's OBD system would be scanned to see if there were any diagnostic trouble codes that commanded your vehicle's check engine light to be activated.

6. The customer is given a report detailing the test results. If the vehicle passes, the motorist can proceed with the vehicle registration process. If the vehicle fails, the customer will be provided with information on how to complete the repair/retest process. The motorist must bring the vehicle back to any of the eleven inspection facilities for reinspection after repairs have been made.

For more information, call
1-800-242-7510 (Within Wisconsin)
1-414-266-1080