Price
Call for price
Hours
Open Mon–Sat
Station type
Test & Repair
Williams Independent is a STAR certified test-and-repair smog check station at 9435 Sierra Ave, Fontana, CA 92335. Open Mon–Sat.
Hours
- Monday
- 8 AM – 5 PM
- Tuesday
- 8 AM – 5 PM
- Wednesday
- 8 AM – 5 PM
- Thursday
- 8 AM – 5 PM
- Friday
- 8 AM – 5 PM
- Saturday
- 8 AM – 2 PM
- Sunday
- Closed
Hours from public business listings. Call to confirm before you go.
What to expect at Williams Independent
Williams Independent can run the inspection and, if your car fails, diagnose and fix it in the same shop. It is STAR certified, so it can test vehicles the DMV directs to a STAR station, including gross polluters.
Most smog checks take 15 to 30 minutes, and most visits are closer to 20.
What to bring
Your registration or DMV renewal notice
It says whether the car needs a STAR station.
The car, with the check engine light off
On a 2000-or-newer car, a lit check engine light fails the test on its own.
A way to pay
The $8.25 state certificate is paid on top of the test when the car passes, unless the station's price or coupon includes it.
What if I fail?
- Williams Independent can diagnose and repair the problem in the same shop, then retest the car.
- BAR's Consumer Assistance Program pays up to $1,450 toward emissions repairs for income-eligible owners.
Been to Williams Independent?
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9435 Sierra Ave, Fontana, CA 92335
Get directions →Hours
- Monday
- 8 AM – 5 PM
- Tuesday
- 8 AM – 5 PM
- Wednesday
- 8 AM – 5 PM
- Thursday
- 8 AM – 5 PM
- Friday
- 8 AM – 5 PM
- Saturday
- 8 AM – 2 PM
- Sunday
- Closed
Hours from public business listings. Call to confirm before you go.
Also listed on
Other stations near Williams Independent
Smog Latino
9421 Sierra Ave #b, Fontana
George's Sierra Shell
9684 Sierra Ave, Fontana
Mill St Smog Check
8958 Sierra Avenue Unit 300, Fontana
Merrill's Smog
16600 Merrill Ave, Fontana
J & S Auto Center
8807 Sierra Ave, Fontana
All States Test Only
16510 Merrill Avenue Unit A, Fontana
Nearby cities in San Bernardino County
Questions about Williams Independent
Williams Independent is open Monday 8 AM to 5 PM; Tuesday 8 AM to 5 PM; Wednesday 8 AM to 5 PM; Thursday 8 AM to 5 PM; Friday 8 AM to 5 PM; Saturday 8 AM to 2 PM. Closed Sunday.
Google lists the following accessibility features at Williams Independent: wheelchair accessible entrance, wheelchair accessible parking, wheelchair accessible restroom.
Verify this station’s license and STAR standing at bar.ca.gov.
Listing updated October 4, 2026.
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BAR field office: Riverside • Licensed since 2007