What California smog history records show and why you need them

Your California smog history is a record of every smog check (also called an emissions test) your vehicle has passed or failed, kept by the state. The DMV and the Bureau of Automotive Repair (BAR) maintain these records together. You might need this history to prove your vehicle passed inspection before selling it, to resolve a registration hold, or to show a mechanic what tests have already been done.

The record includes the test date, whether the vehicle passed or failed, the testing station that performed it, and the vehicle's odometer reading at the time. If your vehicle failed, the record shows what emissions standards it did not meet. This history stays with your vehicle's registration, not with you as the owner — so a new owner can see what the previous owner's vehicle went through.

You do not need to request this history for routine registration renewal. The DMV already has it and will flag your registration if a current smog test is required. You only need to pull your own copy if you are selling the vehicle, troubleshooting a registration problem, or need proof for a specific reason.

Key Takeaways

  • California smog history records are maintained by the DMV and BAR together, and you can view them online through the BAR's Check My Vehicle History tool or request them by mail.
  • You will need your vehicle's VIN (Vehicle Identification Number) and current registration number to look up your smog history.
  • A smog history record shows every test date, pass or fail result, testing station name, and the vehicle's mileage at the time of the test.
  • If your registration is on hold for a failed smog test, you must have the vehicle retested and pass before the DMV will renew your registration.
  • Smog records are tied to the vehicle, not the owner, so they transfer to the next owner when you sell the car.

How to look up your smog history online

The fastest way to see your smog history is through the Bureau of Automotive Repair's Check My Vehicle History tool at bar.ca.gov. This tool is free and shows you every smog test on record for your vehicle going back several years. You will need your vehicle's VIN and your current registration number. The tool displays results when ready.

Go to the BAR website, find the "Check My Vehicle History" link, and enter your VIN in the search box. The system will pull up a list of all smog tests associated with that vehicle. Each entry shows the test date, the result (pass or fail), the testing station's name and location, and your vehicle's odometer reading. If a test failed, you will see which emissions standards the vehicle did not meet.

This online lookup works for vehicles registered in California. If you are looking up a vehicle you no longer own or one that is registered out of state, you may not be able to access the full history through this tool. In that case, you can request records by mail or phone through the BAR.

Requesting smog history by mail or phone

If you cannot access the online tool or need an official printed record, you can request your smog history directly from the Bureau of Automotive Repair. Call the BAR's Consumer information Program at 1-800-952-5210 during business hours. Have your VIN and registration number ready. Staff can tell you over the phone what tests are on file and can mail you an official record if you need it for a transaction.

To request records by mail, write to the Bureau of Automotive Repair, 10949 North Main Street, Suite 101, Salida, CA 95368. Include your vehicle's VIN, your name, your current address, and a brief explanation of why you need the records. Processing by mail typically takes one to two weeks. There is no fee for this request.

You can also visit a DMV office in person and ask for a printout of your vehicle's smog history. Bring your registration and ID. The DMV staff can access the same records and provide you with a copy on the spot, though wait times vary by location.

What to do if your registration is on hold for a failed smog test

If your smog history shows a failed test and your registration will not renew, the DMV has placed a hold on your account. This means your vehicle did not pass the emissions standards required by California law. You cannot renew your registration until you have the vehicle retested and it passes.

Take your vehicle to any Bureau of Automotive Repair-certified smog station. Bring your registration and ID. The test costs between $30 and $70 depending on your vehicle's age and type. If your vehicle passes, the testing station reports the result to the BAR and DMV electronically, usually within one business day. Once the pass is recorded, you can renew your registration online, by mail, or at a DMV office.

If your vehicle fails the retest, you have 30 days to get it repaired and tested again at no additional smog test fee — the station will retest you for free within that window. If you do not pass within 30 days, you will have to pay for a new smog test. Some vehicles that fail repeatedly may need repairs at a Bureau of Automotive Repair-certified repair station, which can be more expensive than a general mechanic.

Understanding smog test requirements and timing

California requires a smog test every two years for most vehicles, though the exact timing depends on your vehicle's model year and registration date. Your registration notice will tell you when your next smog test is due. You can get a smog test up to 90 days before your registration expires, and the test will be valid for the full two-year renewal period.

Some vehicles are exempt from smog testing, including new cars (first four model years), electric vehicles, and vehicles over 30 years old. Your registration notice will say "Smog Check Not Required" if your vehicle is exempt. Even if your vehicle is exempt, your smog history will still show any tests that were performed in the past.

If you move out of state or your vehicle is registered out of state, California smog records do not transfer. However, if you move back to California and re-register your vehicle here, the BAR will have your full history on file from before you left.

Scam alerts and safety information

Do not pay anyone to look up your smog history for you. The BAR's online tool is free, and requesting records by phone or mail costs nothing. Websites that charge a fee to "retrieve" your smog records are not affiliated with the state and are taking your money for information you can get yourself at no cost.

Be cautious of emails or texts claiming to be from the DMV or BAR asking you to verify your vehicle information or pay a fine. The DMV and BAR do not contact vehicle owners by email or text to demand payment. If you receive such a message, do not click any links or provide personal information. Go directly to the official BAR website or call the DMV's main line to verify any claim.

If you are selling your vehicle, provide the buyer with a copy of your smog history showing that the vehicle passed its most recent test. This protects both of you and shows the buyer that the vehicle meets California emissions standards. Do not alter or falsify smog records — this is a crime and can result in fines and criminal charges.

What happens to smog history when you sell your vehicle

Your smog history stays with the vehicle, not with you. When you sell your car, the new owner can look up the complete smog test history using the vehicle's VIN. This means the buyer will see whether the vehicle passed or failed its most recent test and how many times it has been tested over the years.

Before you sell, make sure your vehicle has a current passing smog test on file. If your registration is on hold for a failed test, you must resolve that before the sale. The buyer will not be able to register the vehicle in their name if there is an active smog hold. Provide the buyer with a copy of the passing test result as proof that the vehicle is compliant.

If you are buying a used vehicle, always check the seller's smog history before completing the purchase. Use the BAR's online tool with the vehicle's VIN to see its test record. If the most recent test is a failure or if there are multiple failures, ask the seller whether the vehicle has been repaired and retested. If the vehicle has not been retested, you will have to pay for a test and repairs yourself after you buy it.

Frequently Asked Questions

How far back does my smog history go?

The BAR keeps smog records for several years, typically back to at least the last five to seven years of testing. Older records may still be available through a records request, but the online tool usually shows the most recent tests. If you need records older than what appears online, contact the BAR by phone or mail.

Can I look up someone else's smog history?

No. The BAR's online tool requires your vehicle's VIN and registration number, which you would only have if you own or co-own the vehicle. If you are buying a used car, ask the seller to provide the smog history or use the VIN they give you to check it yourself before you buy.

What if my smog history shows a test I did not authorize?

Contact the Bureau of Automotive Repair when ready at 1-800-952-5210. Provide the test date, testing station name, and explain that you did not authorize the test. The BAR can investigate and correct the record if there was an error. Keep your registration and ID handy when you call.

Do I need my smog history to renew my registration?

No, not directly. The DMV already has your smog history on file and will tell you if a current test is required when you renew. You only need to pull your own copy if you are selling the vehicle, resolving a registration hold, or need proof for another reason.

What if my vehicle failed smog but I sold it — am I still responsible?

No. Once you transfer ownership, the new owner is responsible for the vehicle's compliance. However, if the vehicle was registered in your name when it failed, you may not be able to renew your registration until that hold is cleared. Contact the DMV to clarify your status before selling.