If you live in Arlington, Fairfax, Alexandria or most of the inner DC suburbs, your car probably needs an emissions test every two years to renew its registration. It's separate from the safety inspection, and it trips up a lot of people. Here's how it works.
Who needs the test
The program covers vehicles garaged in Arlington, Fairfax, Loudoun, Prince William and Stafford counties, plus the cities of Alexandria, Fairfax, Falls Church, Manassas and Manassas Park. Most gasoline vehicles there are included. The main exemptions:
- Vehicles manufactured and titled for the current model year or the three before it. DMV may still require a test for newer vehicles first titled in another state.
- Gasoline vehicles at 25 model years old. In 2026, that means model year 2001 and older.
- Fully electric vehicles and qualified hybrids rated at 50 mpg or better in the city.
- Motorcycles and registered antique vehicles.
Diesels are different: 1997 and newer models rated at 8,500 pounds or less are in the program. Our free Virginia inspection and emissions checker sorts this out for your car. Your DMV renewal notice has the final word, so look for "Emissions Inspection Required."
How the test works
On most 1996-and-newer vehicles, it's an OBD test. The inspector plugs into your car's computer and confirms the emissions systems are working, that no emissions fault codes have the check engine light commanded on, and that the "readiness monitors" have completed their self-checks. Gasoline vehicles also get an emissions component inspection and a visible smoke check. Older vehicles get a tailpipe test instead.
The state caps the fee at $30. You can test up to 90 days before your registration expires and still qualify for a two-year renewal. The result goes to DMV electronically, so there's no paper to carry.
Why cars fail, and "not ready"
A check engine light commanded on is a failure under Virginia's rules. A check engine light that doesn't work at all is also a failure.
A "not ready" result is different. It usually means the battery was recently disconnected or the computer was reset, so the monitors haven't finished. That's a rejection from testing rather than a failure, and you aren't charged the test fee. On 2001 and newer vehicles, two or more unfinished monitors means rejection. The fix is usually a few days of normal mixed driving.
The usual culprits behind a check engine light
- Failing oxygen (O2) sensor
- A loose, bad or missing gas cap (an easy EVAP fix)
- Catalytic converter below efficiency
- Engine misfire from worn plugs or coils
If it fails
You get one free retest at the same station within 14 calendar days. Leave time to drive the car after the repair so the monitors can finish. We go through retests, monitor limits, repair waivers and DMV extensions in failed Virginia emissions: what to do next.
The advantage of testing at a full-service shop is simple: if your car fails, we diagnose the cause, repair it and retest it, all in one place. See our emissions inspection service or call TAB Motors at (703) 243-3080.