Maryland's VEIP (Vehicle Emissions Inspection Program) covers most of the state. Every two years you take your vehicle to a VEIP test station for an OBD-II scan. The test costs $14 and is required for most counties - only 9 rural counties are exempt.
Rules change. Verify the current Maryland requirements with the state DMV or environmental agency before you go. This guide reflects the program as of 2026.
| Item | What the Inspector Checks |
|---|---|
| OBD-II scan (1996+ gas) | Check engine light, codes, readiness monitors. |
| Two-Speed Idle (older) | 1995 and older gas vehicles tailpipe tested. |
| Gas cap pressure test | Most vehicles tested for EVAP system integrity. |
| Visible smoke check | Excessive blue or black smoke is a fail. |
| Diesel testing | Diesel-powered vehicles 1997+ also tested under VEIP. |
| No safety inspection | MD does not check safety at VEIP. Safety only at title transfer. |
Check engine light on is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Readiness monitors not ready is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Catalytic converter failure is one of the top reasons cars fail in this state.
Get a Full Diagnosis →EVAP / gas cap is one of the top reasons cars fail in this state.
Get a Full Diagnosis →O2 sensor is one of the top reasons cars fail in this state.
Get a Full Diagnosis →Visible smoke is one of the top reasons cars fail in this state.
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$14 per test. Repairs are extra. Self-service kiosks are the same price.
Nine rural counties: Allegany, Caroline, Dorchester, Garrett, Kent, Queen Anne's, Somerset, Talbot, Wicomico, and Worcester. Other counties statewide require it.
Every two years. Self-service kiosk is available 24/7 if your vehicle qualifies.
Only at title transfer - any vehicle changing ownership in Maryland needs a one-time safety inspection. No recurring annual safety check.
You have 120 days to repair and retest. Free retest within that window. Repair waivers up to $450 may apply.
Yes, battery EVs are exempt. Hybrids are tested like gas vehicles.