Vehicle inspection can include a combination of the following test types depending on vehicle category, model-year, weight, and fuel type:

• Emission Inspection through On-Board Diagnostic (OBD) or tail pipe test
• Visual Catalyst Inspection
• Gas Cap Test

A list of common causes of personal vehicle inspection failures is available at the link below:

• Personal Vehicles - Common Causes of Inspection Failure
• Commercial Vehicles - Common Causes of Inspection Failure
• For-Hire Vehicles - Common Causes of Inspection Failure

Information on DC DMV’s exhaust emissions testing is available at the link below:

• DC DMV Exhaust Emissions Testing

Some vehicles fail inspection; some cannot be tested. More information on inspection failures, unable to tests, and re-tests is available at the link below:

• Vehicle Inspection Failures, Unable to Tests, and Re-tests

When your vehicle passes inspection, you will be able to register it with DC DMV. Bring the vehicle inspection report with you to a DC DMV service center to register your vehicle.