Whether you are buying a used car, preparing for your next smog test, or just trying to confirm your vehicle is registered correctly, knowing how to look up your smog check history in California is a useful skill. The good news: it takes about two minutes and costs nothing.
Here is exactly how to do it.
The Fastest Way: Use the BAR Vehicle Inspection Results Tool
The California Bureau of Automotive Repair (BAR) runs a free online tool that shows every smog check on record for any vehicle registered in the state. Records are updated daily.
How to look up your smog check history:
- Go to bar.ca.gov/inspection
- Enter your vehicle’s license plate number or VIN (Vehicle Identification Number)
- Select your state and hit Submit
- Your full inspection history will appear on screen
That is it. No account, no fee, no waiting.
Your VIN is a 17-character code found on your dashboard (visible through the windshield on the driver’s side), on your registration card, or inside the driver’s side door jamb.
What Your Smog Check History Shows
Once you pull up your results, you will see a record for each smog inspection the vehicle has had in California. Each entry includes:
- The date of the inspection
- Whether the vehicle passed or failed
- The type of test performed (OBD, tailpipe, or visual)
- The name and location of the testing station
- The vehicle’s odometer reading at the time of the test
If you are buying a used car, this report is one of the first things you should check. A long string of passes from a STAR certified station means the vehicle has been well maintained. Repeated failures or a sudden gap in testing history are worth asking the seller about before you sign anything.
How Often Does California Require a Smog Check?
Most vehicles in California need a smog check every two years for registration renewal. Your DMV renewal notice will tell you whether your vehicle needs one for that cycle.
There are a few situations where a smog check is required outside of the regular biennial schedule:
- When you register a vehicle in California for the first time
- When you buy a used car from a private seller (must have passed within the last 90 days)
- When you buy from a dealership (must have passed within the last two years)
- When a family member gifts you a vehicle (with some exceptions for immediate family transfers)
Vehicles eight model years and newer are generally exempt from the biennial test and pay a smog abatement fee instead. Diesel vehicles have no model year exemption.
What If Your Vehicle Has No Smog History?
A few reasons your vehicle might show no results in the BAR database:
The vehicle is newer than eight years. Vehicles within their first eight model years are not required to be tested for registration renewal. They pay an abatement fee instead.
The vehicle was never registered in California. Out-of-state vehicles that have just been brought into the state will not have California smog history yet. You will need to get a smog check before you can register it here. Read our full guide on smog checks for out-of-state vehicles.
The vehicle is exempt. Certain vehicles including pre-1976 models, pure electric vehicles, and some others are not required to be tested.
The vehicle is brand new. Brand new vehicles from a licensed dealer do not need a smog check at the time of purchase.
What If Your Vehicle Failed Its Last Smog Check?
If the history shows a recent failure, do not panic. A failed smog check does not mean your vehicle is permanently off the road. It means there is an emissions-related issue that needs to be diagnosed and repaired before you can pass.
Common reasons vehicles fail include a lit check engine light, failing oxygen sensors, a faulty catalytic converter, or EVAP system leaks. Many of these are straightforward repairs.
Once repairs are made, you go back for a retest. At AB Smog Check in Monterey Park, if we perform the repairs, your retest is free.
California’s Consumer Assistance Program (CAP) can also help income-qualifying drivers cover up to $1,200 in smog-related repairs. Learn more about the CAP program here.
Can You Look Up a Smog History Before Buying a Used Car?
Yes, and you should. The BAR tool works for any California-registered vehicle, not just your own. All you need is the license plate or VIN, which any seller should be happy to provide.
For private seller transactions, the vehicle must have passed a smog check within the last 90 days before the sale. This is a California BAR requirement. If it has not, the seller is required to provide one before transferring ownership. Do not let anyone talk you out of confirming this.
If you are buying from a dealership, the window extends to two years. Still worth checking.
Need a Smog Check in Monterey Park?
If your vehicle is due for a smog test, or you want to confirm it is ready before the DMV renewal deadline, AB Smog Check is open Monday to Friday 9am to 5pm and Saturday 9am to 3pm. No appointment needed.
We are a STAR certified station at 501 E Garvey Ave, Monterey Park, CA 91755. We test regular, diesel, hybrid, and CNG vehicles, and offer $10 off with no coupon required.
Call us at 626-280-2678 or just drive in.
Frequently Asked Questions
Is the California smog check history lookup really free? Yes. The BAR Vehicle Inspection Results tool at bar.ca.gov/inspection is completely free. You do not need to create an account or pay anything to view smog check records.
Can I look up smog history for a car I am thinking of buying? Yes. The tool works for any California-registered vehicle. You just need the license plate number or VIN.
How far back does the smog check history go? The BAR database includes historical records going back many years. For most vehicles you will see every California smog test on record.
What if my vehicle is not showing up? Make sure you are entering the correct license plate or VIN. If the vehicle has never been registered in California, it will not appear in the database.
How do I know if my vehicle needs a smog check this year? Check your DMV registration renewal notice. It will clearly state whether a smog check is required. Alternatively, use the BAR lookup tool to see when your last test was and calculate when the next one is due.
