If you live in San Francisco and your vehicle is due for DMV registration renewal, title transfer, or out-of-state inspection, you likely need a smog check. Sacramento is classified as an enhanced emissions area, which means many vehicles are required to test at a STAR-certified station.
Clean Air Smog is your trusted STAR Certified Smog Check Center in San Francisco— offering fast service, expert inspections, and walk-ins always welcome.
📍 Location: 368 11th St San Francisco, CA 94103
🕒 Hours: Mon–Sat 9am–5pm | Sun 8am–2pm
🌐 Website: https://www.cleanairsmog.com/
🚗 What Does a Smog Check Measure?
When you bring your vehicle in, we inspect:
- Exhaust emissions and tailpipe output
- Catalytic converter performance
- OBD-II (on-board diagnostics) system
- Fuel/air combustion efficiency
- Evaporative system leaks
These checks confirm your vehicle meets California clean-air standards and is running efficiently.
✅ When Do You Need a Smog Check?
You typically need a smog inspection in the following situations:
| Situation | Smog Requirement |
|---|---|
| Registration Renewal | Every 2 years |
| Buying/Selling a Used Car | Usually required at transfer |
| Moving a Car Into California | Must pass before DMV registration |
| STAR-Directed Notice | Must visit a STAR-certified station |
If your DMV paperwork says “STAR required”, you’re in the right place.
⛔ Common Reasons for Smog Failure
| Reason | Explanation |
|---|---|
| Check Engine Light On | Automatic fail |
| Recently cleared codes / battery reset | Monitors not “ready” |
| Dirty spark plugs | Poor combustion & high emissions |
| Bad O2 sensor | Incorrect fuel ratio |
| Loose gas cap | Evap system leak |
| Old/dirty engine oil | Increases fumes |
✅ Easy Tips to Pass on the First Try
- Make sure the Check Engine Light is OFF
- Drive the car for 20–30 minutes before testing
- Avoid disconnecting the battery before your visit
- Replace a loose or worn gas cap
- If overdue, get an oil change beforehand
Just a few simple steps can help prevent retests.
🌿 Not Just Compliance — It’s Car Health
A smog check acts like a “health check” for your engine. Catching issues early can prevent costly repairs, improve fuel efficiency, and keep your car on the road longer — all while helping improve Sacramento’s air quality.
📍 Visit Clean Air Smog Station
Whether you need a quick renewal smog or testing for a title transfer, we make the process quick, easy, and stress-free.
- ✅ Star Certified Smog Check Inspection
- ✅ Out of State Smog Test
- ✅ Regular California Smog Check
- ✅ Smog Check San Francisco
✅ Gross Polluter Certification
✅ We smog diesel’s and hybrid’s
✅ Uber & Lyft Vehicle Inspections
📍 Clean Air Smog :
368 11th St San Francisco, CA 94103
🕒 Mon–Sat 9am–5pm | Sun 8am–2pm
