Price
Call for price
Hours
Open 7 days a week
Station type
Test & Repair
Appointments
Walk-ins welcome
Hours
- Monday
- 9 AM – 7 PM
- Tuesday
- 9 AM – 7 PM
- Wednesday
- 9 AM – 7 PM
- Thursday
- 9 AM – 7 PM
- Friday
- 9 AM – 7 PM
- Saturday
- 10 AM – 6 PM
- Sunday
- 10 AM – 5 PM
Good to know
Languages
English
Payment
Cash, Credit Card
What to expect at Ace Diagnostics
Ace Diagnostics is licensed by the Bureau of Automotive Repair as a Test & Repair smog station in Thousand Oaks, so it 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.
Walk-ins are welcome. 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?
- Ace Diagnostics can diagnose and repair the problem in the same shop, then retest the car.
- Each station sets its own retest price, so ask before the first test.
- BAR's Consumer Assistance Program pays up to $1,450 toward emissions repairs for income-eligible owners.
3139 Los Feliz Dr #5, Thousand Oaks, CA 91362
Get directions →Hours
- Monday
- 9 AM – 7 PM
- Tuesday
- 9 AM – 7 PM
- Wednesday
- 9 AM – 7 PM
- Thursday
- 9 AM – 7 PM
- Friday
- 9 AM – 7 PM
- Saturday
- 10 AM – 6 PM
- Sunday
- 10 AM – 5 PM
Also listed on
Other stations near Ace Diagnostics
Discount Smog Test & Repair
3111 E Thousand Oaks Blvd #5A
Foreign Sports
3121 Thousand Oaks Blvd Unit 2
Import Auto Clinic
3221 E Thousand Oaks Blvd
Thousand Oaks Smog
3185 E Thousand Oaks Blvd
Smog Test Only Center
50 North Skyline Drive
Nearby cities in Ventura County
Questions about Ace Diagnostics
Ace Diagnostics is open Monday 9 AM to 7 PM; Tuesday 9 AM to 7 PM; Wednesday 9 AM to 7 PM; Thursday 9 AM to 7 PM; Friday 9 AM to 7 PM; Saturday 10 AM to 6 PM; Sunday 10 AM to 5 PM. Hours can change on holidays, so call ahead if you are cutting it close.
Ace Diagnostics accepts Cash, Credit Card.
Ace Diagnostics has held a BAR smog license since 2015. You can verify the license status at bar.ca.gov.
Ace Diagnostics has not published a price on SmogCheckDeals. The Bureau of Automotive Repair puts the statewide average at $69.16 as of August 2026, about $65 for a 2000-or-newer vehicle and $73 for 1999-or-older, plus the $8.25 certificate fee. Call (818) 602-5470 for a quote.
Ace Diagnostics does not take online bookings here, but walk-ins are welcome. Call (818) 602-5470 to check the wait.
Staff at Ace Diagnostics speak English.
The closest alternatives in Thousand Oaks are Discount Smog Test & Repair (0.1 mi) and Foreign Sports (0.1 mi). Both are listed further up this page with their ratings and hours.
How we get this data: BAR licenses and STAR status, Google hours and ratings, coupons published by the station.
Verify this station’s license and STAR standing at bar.ca.gov.
Own this shop? Add photos
BAR field office: Valencia • Licensed since 2015