Blog / California Smog Check on a Used Car Is the Seller's Job

October 29, 2026 · Buying Tips · Titles and History

California Smog Check on a Used Car Is the Seller's Job

By Anthony LimpertASE Business Built With Master Automotive Technicians

Who owes the smog certificate on a California used car sale, the 90 day rule, which cars skip it, the VIN lookup that shows failed tests, and what to do if the seller skipped it.

1. In California, the seller owes you a valid smog certificate at or before delivery.
2. From a private seller, the car must have passed within the last 90 days.
3. Gas cars four model years old and newer skip the test. You pay an $8 transfer fee instead.
4. Look up the VIN on the state's free inspection history before you pay.
5. Never buy on a promise that you can smog it later. A failed test becomes your repair bill.

California puts the smog check on the seller by law. Vehicle Code 24007 says the seller must give the buyer a valid smog certificate before or at delivery (California Vehicle Code 24007). So the buyer doesn't pay for it, doesn't book it, and doesn't take the risk.

That one rule changes how you shop. A car that can't pass smog can't be sold to you in the normal way. Sellers still try to flip it onto the buyer, often with a small discount. We'd rather you know the rule before you meet one.

Who Owes the Smog Certificate, Sale by Sale

The answer changes with who sells the car and what it runs on. This table comes from the state's own rules.

The 90 day and two year windows come from the Bureau of Automotive Repair (BAR Smog Check). The family, 1975 and four year rules come from the DMV (California DMV Smog Inspections). The DMV fee table lists the smog transfer fee at $8 (California DMV Registration Fees).

Watch the gap between four and eight years. A gas car skips its renewal smog for its first eight model years. It only skips the sale smog for four. So a five year old car that has never seen a smog station still needs one to change hands.

The salvage row matters for auction buyers. Section 24007 waives the certificate for a car sold by a salvage pool or a dismantler. That car comes to you with no smog promise at all. If you buy that way, read up on an auction inspection first.

Five Checks Before You Hand Over Money

A smog certificate is a pass on one day. These five steps tell you if it's real and if it will hold.

1. Ask for the vehicle inspection report. The station prints it after every test. BAR tells sellers to hand the buyer a copy. It shows pass or fail, and it lists any open safety recalls.
2. Read the date. The certificate is valid for 90 days. Count from the test date to the day you take the car. Day 91 means a new test, on the seller.
3. Run the VIN. BAR's inspection history is free. Enter the VIN, not the plate, since plates change. Records update daily at midnight (BAR inspection history).
4. Look for fails before the pass. Two fails and then a pass a week later is a story. Ask what was fixed and get the receipt.
5. Pay after the certificate, not before. The law says before or at delivery. Hold the money until you hold the report.

A history full of fails is not always bad. A car that failed for a cracked hose and then passed is fine. A car that failed three times and passed at a different station deserves a hard look. The guide to reading a vehicle history report pairs well with the smog record.

Never Take the Smog Discount

The pitch goes like this. The seller says the car just needs a smog. They'll take $100 off if you handle it.

Say no. The law already makes the seller pay for the test. So the $100 buys you nothing but the risk. If the car fails, the repair is yours, and it can cost far more than the discount.

Sold as is doesn't change this either. Section 24007 lists who is exempt, and an as is sticker is not on that list. The guide to as is used car sales covers what that sticker does waive.

Watch for a fresh battery or a cleared code too. BAR says a car won't pass with the check engine light on. It also says to drive a week or two after a battery swap so the readiness monitors can reset. A seller who just cleared codes may tell you the car is fine and simply not ready. Our post on how sellers hide a check engine light shows what that looks like on a scan.

When the Seller Skipped It

Maybe you already drove off with no certificate. Move fast.

• Know the clock. The DMV wants any change of owner reported within 10 days (California DMV title transfers). Smog certification is on the DMV's list of transfer papers.
• Ask the seller in writing. Quote Section 24007 and ask them to get the car tested and pay for it. A text or email gives you a record.
• Get a pretest if they stall. BAR says stations may offer one, with an estimate first. It tells you what a fail would cost before you argue about it.
• Use small claims if you paid for the fix. You can sue a person for up to $12,500, and the filing fee runs $30 to $100 (California Courts small claims). Bring the ad, the messages, the bill of sale and the repair invoice.

Bought from a dealer? A licensed dealer owes the certificate too. Ask in writing first and keep every paper.

What Buyers Say About Smog at Car Lots

The PPI Auto dealer directory grades used car lots from their reviews. It tracks 34,665 independent used lots, from a September 24, 2026 snapshot. That is PPI Auto's own data.

Smog came up as a review topic at just 17 of them, and 12 of those are in California. That makes sense. California ties the test to the sale. Nine of the 12 California lots have enough reviews to grade.

Seven of the nine graded smog lots earn an F. That is 78 percent, against 13 percent of the 1,440 graded used lots in California. None of the nine earn an A, against 20 percent statewide. Nine lots is a small group, so read it as a warning sign, not a ranking.

A topic in reviews doesn't say which way each review went. It does say smog was something buyers at those lots had to fight about. The guide to checking out a car dealer shows how to read a lot's reviews before you go.

Verified Against

• California Vehicle Code 24007, current as of January 1, 2026
• Bureau of Automotive Repair, Smog Check, when you need one and what is required
• Bureau of Automotive Repair, vehicle inspection history lookup
• Bureau of Automotive Repair, Consumer Assistance Program repair assistance
• California DMV, Smog Inspections
• California DMV, Registration Fees
• California DMV, Title Transfers and Changes
• California Courts Self Help, Small Claims
• PPI Auto dealer directory, 34,665 used car lots, September 24, 2026 snapshot (our own data)

We check the readiness monitors and the engine computer before you pay, so a smog surprise shows up on our report and not at the station. See our smog readiness check, or see what an inspection costs.

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