The District of Columbia provides vehicle inspection services to ensure residents that unsafe vehicles and those producing high levels of pollutants are not registered and operated in the District. The inspection program provides residents with a periodic, low cost means to evaluate the health and safety of their vehicle. A report is produced to assist your mechanic in diagnosing and repairing any problems that are discovered.

Vehicles are tested using either the IM/240 computer, the Idle test or the On-board diagnostic computer. These test measure the emission levels.