Smog test prices range from $30 to $80 depending on your state and vehicle type
A smog test (also called an emissions test or smog check) costs between $30 and $80 in most states, though some charge more. California, which runs the strictest program, charges $49.75 for a basic test on most vehicles and $69.75 for a more detailed test on older cars. Texas charges around $30 to $50. New York runs tests through state inspection stations and charges $10 to $15 as part of a full vehicle inspection that costs $30 to $50 total.
The price depends on three things: your state's fee structure, whether your vehicle needs a basic or advanced test, and whether you're testing at a state facility or a private shop. Some states set a fixed fee that all testing stations must charge. Others allow private shops to set their own prices within a range, which means you can shop around.
Your vehicle type matters too. Newer cars (usually 1996 and later) typically need a basic On-Board Diagnostic (OBD) test, which is cheaper and faster. Older vehicles may need a two-speed idle test or loaded mode dynamometer test, which cost more because they take longer and require specialized equipment.
Key Takeaways
- Most smog tests cost $30 to $80, with California at the higher end ($49.75 to $69.75) and Texas and New York at the lower end ($10 to $50).
- Newer vehicles (1996 and later) usually need a cheaper OBD test, while older cars may need a dynamometer test that costs $10 to $20 more.
- Some states set a fixed price all stations must charge, while others let private shops set their own rates, so calling ahead can save you money.
- You can test at state-run facilities, certified private repair shops, or smog-only testing stations, and prices vary by location type.
Where the price difference comes from
States that run their own testing stations (like California's Bureau of Automotive Repair stations) set a single price everyone pays. Private shops in states that allow them to test charge what the market will bear, so a shop in an expensive area may charge $60 while one 20 miles away charges $40. Some states cap the price; others don't.
The test method itself drives cost. An OBD test plugs a scanner into your vehicle's diagnostic port and reads the computer's emissions data—it takes 10 minutes and costs less. A dynamometer test puts your car on a rolling machine that simulates driving while measuring tailpipe emissions. This takes 30 to 45 minutes, requires more equipment, and costs $15 to $25 more. Older vehicles and those with check engine lights often need the dynamometer test.
Location matters too. Testing at a state facility is usually cheaper than at a private repair shop because the state doesn't need to profit on the test itself. A smog-only testing station (a shop that does nothing but emissions tests) is often cheaper than a full-service repair shop, which may charge more because they're cross-subsidizing other services.
How to find the cheapest test in your area
Call three to five testing stations and ask their price for your vehicle year and type. Don't assume online prices are current—shops update their websites inconsistently. When you call, tell them your vehicle's year, make, and model so they can tell you whether you need a basic or advanced test.
In states with fixed prices (California, for example), all certified stations charge the same, so location is your only variable. In states with open pricing, call a state-run facility, a dedicated smog shop, and a local repair shop to compare. The difference between cheapest and most expensive can be $20 to $30.
Ask whether the price includes retesting if you fail. Some shops include one retest; others charge the full fee again. If your vehicle is older or has a check engine light, ask upfront whether they'll need to do a dynamometer test, which costs more. Getting that answer before you arrive saves you from a surprise bill.
What happens if you fail and need to retest
If your vehicle fails the emissions test, you'll need to fix the problem and pay for another test. The retest fee is where the cost can add up. Some shops charge the full test price again ($30 to $80). Others charge a reduced retest fee of $15 to $25. A few include one free retest with the original test price.
Before you leave after a failed test, ask what the retest fee is and whether it's the same as the initial test. If the shop found a specific problem (like a loose gas cap or a faulty oxygen sensor), ask whether they can fix it and whether they offer a discount on the retest if you have them do the repair.
The cost of fixing the underlying problem varies wildly—a gas cap is $10 to $20, but a catalytic converter can be $400 to $1,200. That's why it's worth getting a second opinion from a trusted mechanic if the testing station recommends an expensive repair.
State-by-state cost breakdown
| State | Typical Cost | Notes |
|---|---|---|
| California | $49.75–$69.75 | Fixed price at all Bureau of Automotive Repair stations. Older vehicles and those with check engine lights pay the higher amount. |
| Texas | $30–$50 | Private shops set their own prices. No state-run testing program. |
| New York | $10–$15 (test only) | Part of a full vehicle inspection ($30–$50 total). Done at state inspection stations. |
| Colorado | $25–$45 | Private shops set prices. Denver metro area tends toward the higher end. |
| Massachusetts | $35–$50 | Private inspection stations set their own prices within a state range. |
| Georgia | $20–$40 | Private shops set prices. No state-run program. |
Smog test vs. vehicle inspection: what you're actually paying for
A smog test measures only emissions—what comes out of your tailpipe. A vehicle inspection (also called a safety inspection) checks brakes, lights, wipers, and steering. Some states combine them into one visit; others keep them separate. If your state requires both, you'll pay for both, and the total can be $50 to $100.
In states like New York and Massachusetts, the smog test is bundled into the inspection fee. In California and Texas, they're separate. When you call for a price, ask whether you need just the smog test or whether your state also requires a safety inspection. If both are required, ask for the combined price.
Frequently Asked Questions
Can I get a smog test at any repair shop?
No. Only shops certified by your state can perform smog tests. In California, look for a Bureau of Automotive Repair station. In other states, the Department of Motor Vehicles or Department of Environmental Quality publishes a list of certified testers. Call ahead to confirm they're still certified and open.
Do I have to pay the full price if I fail?
It depends on the shop. Some include one free retest with the original fee. Others charge 50 to 75 percent of the original price for a retest. A few charge the full price again. Ask this before you pay for the first test, not after you fail.
What if my vehicle is too old to test?
Most states exempt vehicles older than 30 to 40 years, depending on the state. If your vehicle is that old, you won't need a smog test at all. Check your state's DMV website or call your local testing station to confirm your vehicle's exemption status.
Is there a way to avoid paying for a smog test?
If your state requires it for registration, no—you'll need to pay and pass to renew your registration. Some states offer a waiver if you've recently failed and made repairs, but you still have to retest. If your vehicle is exempt by age, you don't pay.
Do I need an appointment or can I just walk in?
Many smog-only testing stations take walk-ins and test you in 15 to 30 minutes. Repair shops that also do smog testing may require an appointment. Call ahead to ask whether you need one and how long the wait typically is on the day you plan to go.