Failed Virginia Emissions? Retests, Not Ready and Waivers Explained

A failure, a rejection and a 'not ready' are three different things, and each has a different fix. Here is how to tell which one you have, and what the state lets you do about it.

You went in to renew your registration and came out with a report you did not expect. Before you do anything else, work out which of three outcomes you actually got, because the Northern Virginia program treats them very differently.

Failed, rejected or not ready?

Failed means the vehicle was tested and did not meet the standard. You get a Vehicle Emissions Inspection Report showing what failed, and you need a repair and a retest, or a waiver.
Rejected from testing means the test could not be safely or properly completed. DEQ is explicit that a rejection is not the same as a failed test, and you are not charged the inspection fee. Reasons include unsafe tires, fluid or exhaust leaks, visible smoke, a missing gas cap and engine or drivetrain problems.
Not ready is a type of rejection. The car's computer has not finished its self-checks, so there is nothing to grade yet.

If it failed: the free retest

A failing vehicle gets one free retest at the station that did the original test, within 14 calendar days of the initial inspection. Take that window seriously. Book the repair quickly, and leave enough time to drive the car before the retest, because the repair itself often clears the computer's readiness data. That is one of the most common ways people get caught: the repair is good, but the car goes back too soon and comes up not ready.

The check engine light rule

On most 1996-and-newer vehicles, the test reads the on-board diagnostic (OBD) system rather than measuring the tailpipe. Under Virginia's regulation, emissions-related fault codes that command the check engine light on are a failure. A light that does not work at all is also a failure.

Which means clearing the code yourself will not help. Erasing codes also resets the readiness monitors, so you trade a failure for a not-ready result, and the fault comes straight back if the cause is still there.

The usual causes are oxygen or air-fuel sensors, catalytic converter efficiency, evaporative system leaks, misfires and mass airflow problems. A code only tells you where to start looking, which is why we covered the difference between a code and a diagnosis in its own post. Our engine diagnostics service exists to stop you buying parts you did not need.

Not ready: how many monitors are allowed?

Your car's computer runs a set of self-checks called readiness monitors. Battery disconnections, some repairs and cleared codes wipe them, and they only reset after the car has been driven through the right conditions. Virginia's rule sets a specific limit:

Model year 2001 and newer: rejected if two or more monitors are not ready.
Model years 1996 to 2000: rejected if three or more monitors are not ready.
Catalyst repairs: a car that failed on a catalytic converter code is rejected at reinspection if its catalyst monitor is not ready.

So one incomplete monitor on a 2015 car is fine. Two is not. A car that is at the limit is exactly the sort of thing a good shop can check with a scan tool before you pay for a test.

How to get monitors to finish

There is no universal recipe, because each manufacturer has its own conditions, but this works for most cars:

Start the car cold, ideally after it has sat overnight.
Drive a normal mix of city and highway for several days. Some monitors need steady highway speed, and others need stop-and-go.
Keep the fuel level between about a quarter and three quarters, since evaporative system monitors often will not run on a nearly full or empty tank.
Avoid disconnecting the battery or clearing codes during this time.

Very cold weather can slow some monitors down, so allow extra time in January. If a monitor refuses to finish after a week or two of normal driving, something may be stopping it, and that is worth a diagnostic.

Running out of time before your registration expires

You have a few options, and timing matters:

Test early. You can have the test done up to 90 days before your registration expires and still qualify for a two-year registration. Test any earlier and you may only be eligible for one year.
Ask DMV for an extension. DMV offers a one-month extension for vehicles that need a test, at a customer service center or DMV Select office. It costs $10 plus prorated registration fees for that month, your registration has to be valid and expiring in the month you ask for, and it is allowed once per registration period.
Check your history. DEQ has an online lookup that shows a vehicle's emissions inspection history, which helps if you are not sure when it was last tested.

What about a waiver?

Virginia offers a waiver for vehicles that still cannot pass after a real repair effort, but the conditions are strict:

The car must have failed an initial test and failed a retest.
Emissions-related diagnostic and repair costs must meet or exceed the current waiver threshold. DEQ reviews that figure annually and adjusts it based on the Consumer Price Index, so check with DEQ or your inspection report for today's number.
Only work done by or under a Certified Emissions Repair Technician at a Certified Emissions Repair Facility counts.

That last point is the expensive one. You are free to have repairs done anywhere you like, but money spent elsewhere does not count toward a waiver. If your car has a hard problem and you think a waiver is a possibility, ask whether a shop is certified before you pay for work. DEQ can confirm who is. Keep every receipt.

Is your car even supposed to be tested?

Not every vehicle is in the program. Fully electric cars, qualified hybrids, motorcycles and gasoline vehicles 25 model years old or more are exempt, among others, and in 2026 that means model year 2001 and older for gasoline cars. Newer cars get four years before the first test, unless they were first titled in another state. Our free Virginia inspection and emissions checker will work out where you stand.

Your renewal notice has the final word. Look for the line that says "Emissions Inspection Required."

What it costs

State law caps the emissions test at $30. Repairs are separate, and they range from a gas cap to a catalytic converter. A proper diagnosis comes first, so you pay for the fix your car needs, and under Virginia law you can ask for a written estimate before work begins.

Bring it to us

TAB Motors Arlington handles emissions testing, diagnosis and repair under one roof at 4035 Old Dominion Dr in Arlington. If you are not sure whether your car is ready to test, call (703) 243-3080 before you come in and we will tell you what to look for.

Sources

General information, checked November 4, 2026. Rules change, so confirm anything that matters with the agency involved. This is not legal advice.