Testing Procedures

Position 1

Picture of person exiting their vehicle and entering a booth

1. The inspector asks you to exit your vehicle and wait inside the booth while your vehicle is tested.


2. The inspector performs a tampering inspection on your vehicle. They make sure your vehicle has both a gas cap and a catalytic converter (if it was manufactured with both).  They also check for obvious fluid leaks, bald tires and other safety concerns that may prevent your vehicle from being tested.


3. The inspector enters the Vehicle Identification Number (VIN) into the computer so that the emissions standard for your vehicle can be pulled up and the vehicle identified. 

Position 2

Inspecting the car

OBD Test

If your vehicle is 1996-or-newer (gasoline) or 1997-or-newer (diesel), it will be tested with On-Board Diagnostics (OBD II) technology.* A handheld reader device will be connected to your vehicle's data port to download emission control system performance codes.

If your vehicle's data port is inaccessible, your vehicle will be rejected and asked to return once the data port is made accessible.

Position 3

Getting back into the car

1. The vehicle is now driven from Position 2 to Position 3 and prepared for the gas cap pressure test. The inspector will remove your gas cap and connect it to a gauge that measures pressure. This ensures that gasoline vapor is not being lost from your tank. 


2. Once the testing is complete, the inspector will hand you your Vehicle Inspection Report and explain the results. 


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