Skip the auto shop - Our mechanics make house calls

Q: Do All States Require Emissions Testing?

asked by on

Do all states require emissions testing?

A: The short answer is – yes, every state requ...

The short answer is – yes, every state requires emission testing. However, there can be a lot of variation from state to state and even within a state. All states require annual or biennial tests, but in many states, testing is limited to certain geographic areas. For example, in New Mexico only one county requires biennial testing, and only if the vehicle is registered in that county. In some states, only vehicles that fall within certain weight categories need to be tested, and vehicles built before a certain model year or older than a certain number of years are exempt. The type of test can also vary from something as simple as a visual inspection that all smog control equipment is in place on the vehicle, to a full engine OBD II function test and tail pipe emissions test with an exhaust gas analyzer. Emission testing is usually in conjunction with vehicle re-registration or resale. For best results, check with your state’s department of motor vehicles or air resources authority.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: A lot of smoke coming from the car. What's the issue?

Hi, thanks for writing in. If you have smoke being emitted from your vehicle, it is likely due to a fluid that is leaking and landing onto a hot surface such as the exhaust. Typically when smoke comes from under...

Q: What Emissions Tests Are Performed on My Car?

The actual emissions testing process varies considerably from one state to another, as well as with different vehicles. However, your OBD system will definitely be checked. You may also need a tailpipe test, a gas cap test, and a visual...

Q: Check engine light on, black liquid in the exhaust

Whether or not this is serious would depend on the reason the check engine light is on. I would recommend having your vehicle's trouble codes scanned with an OBD2 scanner by a certified mechanic. Once the codes have been...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...