Do you need a smog check to sell a car in California?

Yes, in most cases: when you sell a car in California, you must give the buyer a valid smog certification from a test passed in the last 90 days (DMV, BAR). As of 2026, gas and hybrid cars from 2023 and newer skip the test and the buyer pays an $8 transfer fee instead.

The rule applies statewide, including rural areas that never require a smog check at renewal (BAR Reference Guide).

What does the DMV say about a smog check when you sell?

The DMV answers this directly: "If you are selling your car, you need to give the new owner a valid smog certification when you sell the car." It adds the one common exception: "If the car you are selling is less than four years old, you do not need to get a smog inspection. Instead, the new owner of the car will need to pay a smog transfer fee."

BAR lists the same exception as gas, hybrid and alternative-fuel vehicles "four model years and newer (for change of ownership only)". Seller responsibility is the part people miss: the seller owes the certification on a transfer of ownership, not the buyer.

Which cars need a smog check to be sold?

Whether your car needs a smog check to be sold depends on its model year and fuel. A gas or hybrid car needs one unless it is 1975 or older or one of the newest four model years. A 1998 or newer diesel up to 14,000 lb always needs one, and electric cars and motorcycles never do.

To work out next year's cutoff, add four to the model year: that is the first year the car needs a test for a sale. A 2023 car first needs one in 2027.

The sale rule catches newer cars the renewal rule does not. A 2021 car is exempt from the renewal test in 2026, but its owner still has to get it tested to sell it.

Who pays for the smog check when you sell a car?

The seller is responsible for the smog check in a California sale. The DMV says that if you are selling your car, you need to give the new owner a valid smog certification, and BAR says the check is required before you sell. Neither agency lists an exception for a car sold as-is, or for a buyer who agrees to handle it.

The buyer needs the certification too, because it is on the DMV's list of what a buyer submits to take ownership. If the car fails after the sale, the buyer may be stuck with a car they can't register, so expect a careful buyer to insist on a pass first.

How long is a smog certificate good for when you sell?

A California smog certificate is good for 90 days from the day the car passes, and the station sends it to the DMV electronically (BAR). The buyer's transfer has to reach the DMV inside those 90 days, so get the test once you are close to selling. If the 90 days run out first, you need a new test.

What if the car just passed for its renewal?

You don't need a second test if the car passed for its registration renewal and the transfer reaches the DMV within the certificate's 90 days. You do owe the buyer a signed Vehicle Emission System Statement (REG 139). That form lets the buyer test the car before the sale. If it fails, you reimburse the test and pay for the repairs before the sale can finish.

Do family transfers need a smog check?

A transfer between immediate family members does not need a smog check for the change of ownership. The DMV counts a spouse, domestic partner, sibling, child, parent, grandparent or grandchild, and you claim the exemption on a Statement of Facts (REG 256).

Two limits catch people:

• A relative bought the car for you. If they did not title it in their own name first, the DMV requires a smog inspection.
• A renewal smog check is due. REG 256 says the family exemption does not apply if a biennial smog check is required for the registration. Check the renewal notice before you transfer.

What other sales don't need a smog check?

A few other transfers skip the test, according to BAR's Reference Guide and REG 256:

• Adding another person to the title.
• A sole proprietorship transferring the car to the proprietor.
• Certain lease transfers where the lessee or operator stays the same.
• A car located outside California at the time of transfer, except in Nevada or Mexico.

How do you sell a car with a smog check, step by step?

1. Check the model year against the table above.
2. Get the test at any licensed station. Make sure the check engine light is off first; how to pass a California smog check covers the prep.
3. Give the buyer the vehicle inspection report. BAR asks sellers to hand over a copy.
4. Sign over the title and give the buyer the other documents on the DMV's list.
5. Report the sale within 5 days. File a Notice of Transfer and Release of Liability online or on form REG 138.

The buyer then has 10 days to transfer ownership.

What if the car fails before you sell it?

If your car fails, you can't give the buyer a certificate until it is repaired and passes. Start with what to do after a failed smog check.

State repair money probably won't help: BAR's Consumer Assistance Program lists a change of ownership as a common reason for denial. If repairs cost more than the car is worth, look at vehicle retirement, which pays $1,350 to $2,000 if the car and owner qualify.

How much does a smog check cost before a sale?

A smog check cost $69.66 on average in BAR's September 2026 report, plus the $8.25 state certificate on a pass. Coupons on SmogCheckDeals had a median price of $39.75 before the certificate as of October 2026, so a typical coupon comes to about $48 at the counter.

See prices by county in our price report, compare coupons, or find a station near you.

What about selling to a dealer?

DMV and BAR consumer pages cover a dealer selling to you, not you trading a car in. BAR says a car bought from a dealership must have passed within the past two years. For a trade-in, ask the dealer whether they want a test before you pay for one.

Sources: DMV: Smog inspections · BAR: Smog Check · BAR Smog Check Reference Guide · DMV: REG 139 · DMV: REG 256 · DMV: Private-party purchases · DMV: Registration fees · BAR: CAP repair assistance

Rules checked against BAR and DMV sources on October 30, 2026.