Ace Diagnostics

Yes. Ace Diagnostics is STAR certified with the California Bureau of Automotive Repair, so it can test vehicles the DMV directs to a STAR station, including gross polluters.

No. Ace Diagnostics is licensed as a Test & Repair station. This station can run your smog test and, if the vehicle fails, diagnose and repair it in the same shop.

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.

Yes. Ace Diagnostics accepts walk-ins, so you can drive in without booking ahead.

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.

Bring the car, your registration or DMV renewal notice, and a way to pay. Most smog checks take 15 to 30 minutes, and most visits are closer to 20.

Because Ace Diagnostics is a Test & Repair station, it can diagnose and repair the problem in the same shop, then run the free retest within 30 days. If the repair bill is steep, California's Consumer Assistance Program covers up to $1,200 of emissions repairs for qualifying owners.

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.