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Division of Motor Vehicles

Vehicle Services Inspections


Delaware's Malfunction Indicator Light (MIL)

The DMV technician visually determines if the MIL stays illuminated when the engine is running. If this occurs, your vehicle FAILS the examination. That is, the on-board computer of the vehicle detected a fault that may cause high emissions. Sometimes an illuminated MIL indicates that the vehicle needs service. However, if the MIL flashes, immediate service is necessary. In either case, expensive damage may result if not corrected.

If your vehicle FAILS the Delaware MIL test you MUST have it repaired by a Delaware Certified Repair Technician (CERT).

The CERT will perform a complete diagnostic test of the on-board computer system to determine what condition's exist to cause an illuminated MIL and perform repairs to correct the problem. When you return for a retest, be sure to bring the CERT repair form for the DMV technician to review.