What G&G Smog Only Does

G&G Smog Only is a smog testing and certification service, not a repair shop. They test your vehicle's emissions system to see whether it meets California's standards, and if it passes, they issue the smog certificate you need to register or renew your vehicle's registration with the Department of Motor Vehicles (DMV).

The service is limited to testing and paperwork — they do not repair engines, replace catalytic converters, or fix emissions problems. If your vehicle fails the test, you will need to take it to a repair shop, fix the issue, and return to G&G or another smog station to retest.

G&G operates as an independent smog station, meaning they are licensed by the state but are not part of the DMV or any government office. You go to them directly, pay their fee, and they send the results to the DMV electronically.

Key Takeaways

  • G&G Smog Only tests whether your vehicle's emissions meet California standards and issues a certificate if it passes.
  • They do not repair vehicles — if you fail, you must fix the problem elsewhere and return for a retest.
  • You pay G&G directly for the test; the fee varies but is typically between $30 and $70 depending on your vehicle type.
  • Results are sent to the DMV electronically, so you do not need to mail anything yourself.
  • You will need your vehicle registration, proof of ownership, and a valid ID when you arrive.

When You Need a Smog Test

California requires a smog test when you register a vehicle for the first time in the state, when you renew your registration every two years, or when you transfer ownership to someone else. Vehicles that are model year 1975 or older, or electric vehicles, are exempt from testing.

If you recently moved to California or bought a used vehicle, check your registration paperwork or contact the DMV to confirm whether a current smog certificate is required before you can complete registration. Some vehicles are also exempt if they are registered as classic cars or have a specific historical designation.

What Happens During the Test

When you arrive at G&G, bring your vehicle registration, proof of ownership (title or bill of sale), and a valid ID. The technician will connect a probe to your vehicle's tailpipe and measure the levels of nitrogen oxides, carbon monoxide, and other pollutants in your exhaust.

The test itself takes about 10 to 15 minutes. Your vehicle's engine must be warmed up and running smoothly for an accurate reading. If your check engine light is on, the test will fail automatically — you must have that issue diagnosed and repaired first.

Once the test is complete, G&G sends the results to the DMV within 24 hours. If you pass, the DMV receives your certificate electronically and you can proceed with registration. If you fail, you receive a written report showing which emissions standards your vehicle did not meet.

What to Do If Your Vehicle Fails

A failed smog test means your vehicle's emissions are above California's limits. You will receive a report listing the specific pollutants that exceeded the standard. Common reasons for failure include a faulty oxygen sensor, a clogged air filter, worn spark plugs, or a malfunctioning catalytic converter.

Take the failure report to a repair shop — any shop, not necessarily G&G — and have them diagnose and fix the problem. Repairs can range from $50 for a straightforward fix like replacing an air filter to several hundred dollars for a catalytic converter replacement. After repairs are complete, return to G&G or any other licensed smog station for a retest.

California allows you to retest at no additional charge within 30 days if you fail, though some stations may charge a reduced fee. Keep your failure report and bring it with you when you retest.

Cost and Payment

G&G Smog Only's test fee varies depending on your vehicle type. A standard passenger car test typically costs between $30 and $50. Trucks, SUVs, and vehicles with diesel engines may cost more. Call ahead or check their website to confirm the exact price for your vehicle.

Payment is due at the time of the test. Most smog stations accept cash, credit cards, and debit cards. If you fail and need to retest, you may pay a reduced retest fee or no fee at all within the 30-day window, depending on the station's policy — ask when you receive your failure report.

How to Find Your Nearest G&G Location

G&G Smog Only operates multiple locations across California. You can find the nearest one by searching online for "G&G Smog Only" plus your city or zip code, or by visiting their website if they maintain one. Call ahead to confirm their hours and to ask whether they can test your specific vehicle type.

You are not required to use G&G — any California-licensed smog station can test your vehicle and issue a certificate. If G&G's location is inconvenient, search for other licensed stations near you. The test and certificate are the same regardless of which station you choose.

What Happens After You Pass

Once you pass the smog test, G&G sends your certificate to the DMV electronically. You do not need to pick up a physical copy or mail anything. Within 24 hours, the DMV will have your results and you can complete your vehicle registration online, by mail, or in person at a DMV office.

Bring your registration renewal notice, proof of insurance, and payment to the DMV. Your smog certificate is now part of your registration file and you do not need to show it separately. Your new registration is valid for two years, at which point you will need another smog test to renew again.

Frequently Asked Questions

Can I get a smog test the same day I need to register my vehicle?

Yes. Most smog stations, including G&G, can test you same-day if you walk in during their hours. However, if you fail, you will need time to repair the vehicle and retest before you can register. Plan ahead if possible so you have time for repairs if needed.

What if my check engine light is on?

Your vehicle will fail the smog test automatically if the check engine light is illuminated. Have the problem diagnosed at a repair shop first, get it fixed, and confirm the light is off before you return for testing. The diagnostic cost is separate from the smog test fee.

Do I need an appointment at G&G Smog Only?

Most smog stations operate on a walk-in basis, but some accept appointments. Call G&G directly to ask whether appointments are available at your location. Walk-ins are usually accommodated, though wait times vary depending on how busy they are.

What if I move out of California after I pass the smog test?

Your smog certificate is only valid in California. If you move to another state, you will need to follow that state's emissions testing rules, which vary widely. Your California certificate does not transfer.

Can I retest at a different smog station if I fail?

Yes. You can retest at any licensed California smog station, not just G&G. Some stations offer reduced retest fees within 30 days of a failure. Call around to compare prices if cost is a concern.