5320 Old Redwood Hwy Unit B

Petaluma, California 94954

101 Express Smog

"We Perform Smog Tests on ANY Vehicle!"

Frequently Asked Questions


Does my California registered Hybrid vehicle need a smog check?

Yes. Starting April 2015, this is required by the state inspections.


My renewal notice doesn't specify that I need to go to a test-only center. Can you still smog it?

Yes. We can perform a smog test on your car whether or not it has been directed to a test-only center.


Can you send my smog results to the DMV if I don't have my renewal form with me?

Yes. We use the Vehicle Identification Number that is imprinted on the vehicle itself to identify the vehicle with the DMV.


Will my car pass with the check engine light on?

No. However, you may still want to have your car smogged anyway so you can take advantage of the Consumer Assistance Program to help pay for repairs.


Will my car pass with an aftermarket air intake or other modification?

Aftermarket parts such as air intakes need a sticker with an eo# affixed to the vehicle to prove that those parts are legal for street use in California. If you have specific questions about specific parts on your car, ask us before we start the smog check, not after we start.


Can you smog my full-sized motor-home?



Can you smog my All-Terrain Vehicle?



What are the environmental benefits of Smog Check?

The Smog Check program has greatly reduced air pollution created by California's 30 million cars. According to the California Air Resources Board, the program removes more than 360 tons of smog-forming pollutants from the air every day.


What is a Test-Only station?

Test-Only stations are licensed to only perform Smog Checks. State law prohibits them from making repairs.


Why are some vehicles required to go to a Test-Only for their Smog Check?

Vehicles with expected high emissions levels are selected for testing at these stations.

Services at this location

✓ Regular Smog

✓ Test Only

✓ Change of Ownership

✓ Document Transfer

✓ Out of State Vehicle Check

(Initial California Check)

✓ New Tags Electronically Transmitted to DMV

Contact Express Smog

101 Express Smog

5320 Old Redwood Hwy

Petaluma, CA 94954

(707) 664-9600


Monday - Saturday 8:30 am - 5:30 pm

Will my vehicle be tested more often under the new Smog Check program?

No. Your vehicle must be tested every other year, just as before. A Smog Check is also required when you sell your car.


How can I help my vehicle pass Smog Check?

Proper and regular maintenance according to your Owner's Manual, and not tampering with the emissions control equipment are keys to passing Smog Check and lowering emissions from your vehicle.


What do I do if my vehicle fails Smog Check?

You will need to get your vehicle repaired so it can pass its Smog Check retest in order to complete your registration. But, first see if you are eligible for our Consumer Assistance Program (For information, see sections on the Consumer Assistance Program below.) If you are not eligible, you may want to visit a Smog Check station participating in our Gold Shield program. (For information, see section on Gold Shield below.)


What is a Gross Polluter?

Some vehicles that fail their smog inspections give off such high levels of pollution that a category called "Gross Polluter" was created. BAR identifies these vehicles to encourage their immediate repair. Gross Polluters are some of the worst polluting vehicles on California roadways.


What if I can't afford the repairs?

The Consumer Assistance Program (CAP) helps many Californians whose vehicles need Smog Check repairs. CAP allows qualified motorists to receive up to $500 in financial assistance for Smog Check repairs. You may qualify for repair assistance in one of two ways:

· Your vehicle requires a Smog Check at a Test-Only station, or

· Your income falls within certain levels.


How can I apply for CAP?

To get an application, visit online a www.smogcheck.ca.gov or call 1-800-952-5210. If you intend to apply for the program, do not have any repairs done on your vehicle. You must first submit an application and have it approved. You will then receive a list of participating stations where you can take your vehicle to have it repaired.


Who administers the Smog Check program in California?

The Smog Check program is administered by the Department of Consumer Affairs, Bureau of Automotive Repair (DCA/BAR). BAR licenses and regulates more than 7500 Smog Check stations, about 14,000 Smog Check technicians, and 34,000 automotive repair dealers across the state.


Who needs a smog check?

There are three reasons to get a smog check:


1.Registration Renewal: Every two years on most vehicles you are required to get a smog check to renew your registration with D.M.V.

Gasoline vehicles newer than 6 years old, hybrids, motorcycles, gasoline vehicles 1975 or older, and diesel vehicles 1997 and older are exempt from this requirement.


2.Change of Ownership: Most vehicles need a smog check when they are bought or sold. It is the seller's responsibility to have the vehicle inspected within 90 days of the transaction. If the vehicle is not registered within 90 days of being smogged it will need to be inspected again.

Gasoline vehicles newer than 4 years old, hybrids, motorcycles, gasoline vehicles 1975 or older, and diesel vehicles 1997 and older are exempt from this requirement. Also, transfer of title between certain family members does not require a smog check.

More information is at the the state's website.



3.Bringing in a car from out of state: Most cars coming from out of state seeking registration in California need to be smogged.

Hybrids, motorcycles, gasoline vehicles 1975 or older, and diesel vehicles 1997 and older are exempt from this requirement.


Do I need to smog my diesel vehicle?

Maybe. Diesel vehicles 1997 and older are smog exempt. Diesel vehicles with a Gross Vehicle Weight over 14,500 lbs are also exempt from the smog inspection.

Can you smog my all-wheel drive vehicle?

Yes. All-wheel drive vehicles are smogged doing a two-speed idle test rather than being tested on a dynamometer.

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