What Smog and Go Is

Smog and Go is a vehicle emissions testing and repair program run by the California Air Resources Board (CARB) that lets drivers with older, high-polluting vehicles reduce their registration fees or avoid registration suspension by repairing emissions problems or retiring the vehicle. Instead of paying full registration costs or facing a registration hold, you can take your vehicle to a participating repair shop, have the emissions issue fixed, and get a certificate that satisfies the requirement.

The program exists because California has stricter air quality standards than federal law requires. Vehicles that fail smog checks — the biennial or triennial emissions test required for registration — are flagged as gross polluters. Smog and Go gives you a path to fix the problem without losing the ability to register your car.

You do not have to use Smog and Go. You can also pay the full registration fee, repair the vehicle on your own timeline, or retire it. But if your vehicle failed its smog check and you want to keep driving it legally, this program is the fastest way to clear the registration hold.

Key Takeaways

  • Smog and Go applies only to vehicles that failed a smog check and are flagged as gross polluters by the California Air Resources Board.
  • You must take your vehicle to a CARB-certified repair shop within 30 days of receiving notice of the registration hold to avoid suspension.
  • The repair shop performs the work, issues a certificate of compliance, and reports the repair directly to the Department of Motor Vehicles.
  • You pay for the repair itself, but the program waives or reduces registration penalties that would otherwise explore to a failed smog vehicle.
  • If repair is not economically feasible, you can retire the vehicle through the program and receive a retirement incentive instead.

Who Is Flagged for Smog and Go

Not every vehicle that fails a smog check enters the Smog and Go program. The California Air Resources Board identifies gross polluters — vehicles that emit pollution at levels significantly above the state standard. These are typically older vehicles with serious emissions control system failures, such as a broken catalytic converter, faulty oxygen sensor, or engine light that indicates an emissions-related problem.

When you fail a smog check, the test facility reports the results to the DMV. If your vehicle meets the gross polluter criteria, the DMV sends you a notice that your registration is suspended and directs you to the Smog and Go program. The notice includes a important date — usually 30 days — to either repair the vehicle through the program or pay a penalty to restore registration.

Vehicles that fail smog checks but do not meet the gross polluter threshold are not part of Smog and Go. You can straightforward repair the vehicle on your own and retake the smog test without program involvement.

How to Use Smog and Go: The Repair Path

If you choose to repair your vehicle, you must take it to a CARB-certified repair shop within the important date stated in your DMV notice. Not all repair shops participate — you can find a list of certified shops on the California Air Resources Board website or through the DMV's online locator tool.

At the shop, the technician will diagnose the emissions problem and perform the necessary repair. Common repairs include replacing a catalytic converter, fixing an oxygen sensor, repairing a fuel system leak, or addressing an engine control issue. The shop charges you for the repair work and parts; there is no state subsidy for the repair cost itself.

Once the repair is complete, the shop performs a smog test to confirm the vehicle now passes. If it does, the shop issues a Certificate of Compliance and reports the repair electronically to the DMV. Your registration hold is lifted, and you can renew your registration at normal cost. You do not need to visit the DMV yourself — the shop handles the reporting.

If the vehicle still does not pass after repair, the shop will tell you what additional work is needed. You can choose to have more work done, take the vehicle elsewhere, or pursue the retirement option instead.

The Retirement Option and Incentive

If repair costs are high relative to the vehicle's value, or if you straightforward want to remove the vehicle from the road, Smog and Go includes a vehicle retirement incentive. You can surrender the vehicle to a participating dismantler or recycler, and the program provides a payment to offset the loss.

The incentive amount varies by vehicle type and year. Older, heavier vehicles typically receive higher incentives than newer or lighter ones. You can check the current incentive amount for your specific vehicle on the CARB website before deciding whether retirement makes financial sense compared to repair.

To retire a vehicle, you contact a CARB-certified dismantler, arrange for the vehicle to be towed or driven there, and sign over the title. The dismantler reports the retirement to the DMV and CARB, and you receive the incentive payment. Your registration hold is cleared, and the vehicle is removed from service.

important date and What Happens If You Miss Them

The DMV notice you receive when flagged as a gross polluter includes a specific important date — typically 30 days from the notice date — to either repair the vehicle through Smog and Go or pay a penalty to restore registration. This important date is firm.

If you do not act by the important date, your vehicle registration is suspended. You cannot legally drive the vehicle, and driving a suspended vehicle can result in a citation and fine. You can still repair the vehicle or retire it after the important date, but you will also owe a penalty fee to restore registration, which is separate from repair costs.

If you need more time, contact the DMV before the important date expires. In some cases, the DMV may grant a brief extension if you can show you have already scheduled a repair appointment. Do not wait until after the important date to ask.

Repair Costs and What to Expect

Repair costs depend entirely on what is wrong with your vehicle. A faulty oxygen sensor might cost $200 to $400 to replace. A catalytic converter can range from $500 to $2,500 or more depending on the vehicle. An engine control module repair or replacement can be $1,000 or higher. There is no fixed price — you will need a diagnosis from the repair shop to know what you are facing.

Before committing to a repair, get a written estimate from the shop. Some shops offer free or low-cost diagnostics to identify the problem. Compare estimates from multiple CARB-certified shops if possible, as prices vary. If repair cost exceeds the vehicle's value, the retirement incentive may be the better financial choice.

The repair cost is your responsibility. The state does not subsidize repairs through Smog and Go. What the program does is waive the registration penalty you would otherwise pay if you let the important date pass without acting.

Finding a Certified Repair Shop

The California Air Resources Board maintains a searchable database of certified repair shops on its website. You can search by location, vehicle type, or shop name. The list includes independent shops, dealerships, and chain repair facilities that have met CARB training and equipment standards.

When you contact a shop, confirm that it is CARB-certified for Smog and Go repairs and ask whether it can handle your specific vehicle type and emissions problem. Some shops specialize in certain makes or repair types. Ask about wait times, as some shops may have a backlog during peak smog check season.

You can also call your local air quality management district or visit the DMV website for referrals to participating shops in your area.

Frequently Asked Questions

What if I repair my vehicle but it still fails the smog test?

The repair shop will tell you what additional work is needed. You can authorize more repairs, seek a second opinion at another certified shop, or choose to retire the vehicle instead. The shop cannot issue a Certificate of Compliance until the vehicle passes, so the registration hold remains in effect until one of these paths is completed.

Can I repair the vehicle myself instead of taking it to a certified shop?

No. Smog and Go requires that repairs be performed by a CARB-certified repair shop. The shop must perform the work, test the vehicle, and report the results to the DMV. Self-repairs do not satisfy the program requirement, though you can always repair the vehicle on your own time and retake the smog check outside the program if you prefer.

Do I have to use Smog and Go if my vehicle is flagged?

No. You can pay the registration penalty to restore your registration, repair the vehicle on your own schedule, or retire it without using the program. Smog and Go is an option designed to make it faster and easier to clear a registration hold, but it is not mandatory.

How long does the repair process take?

Diagnosis and repair typically take one to three days, depending on the shop's workload and the complexity of the problem. Once the repair is complete and the vehicle passes the smog test, the shop reports the Certificate of Compliance to the DMV electronically, usually within one business day. Your registration hold is lifted when ready upon receipt.

What happens to my vehicle after I retire it through the program?

The vehicle is towed or driven to a CARB-certified dismantler, where it is dismantled for parts and recycled. The dismantler removes hazardous fluids, separates materials, and processes the vehicle according to environmental standards. You receive the retirement incentive payment, and the vehicle is removed from the road permanently.