Stg Auto Service

No. Stg Auto Service is not STAR certified. If your DMV renewal notice says "STAR Station Required," you will need to visit a STAR certified station instead.

No. Stg Auto Service 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.

Stg Auto Service is open Monday 9 AM to 9 PM; Tuesday 9 AM to 9 PM; Wednesday 9 AM to 9 PM; Thursday 9 AM to 9 PM; Friday 9 AM to 9 PM; Saturday 9 AM to 9 PM; Sunday 9 AM to 9 PM. Hours can change on holidays, so call ahead if you are cutting it close.

Yes. Stg Auto Service accepts walk-ins, so you can drive in without booking ahead.

Stg Auto Service accepts Cash, Credit Card.

Stg Auto Service has held a BAR smog license since 2020. You can verify the license status at bar.ca.gov.

Stg Auto Service 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 (909) 403-4635 for a quote.

Stg Auto Service does not take online bookings here, but walk-ins are welcome. Call (909) 403-4635 to check the wait.

Staff at Stg Auto Service 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 Stg Auto Service 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 Montclair are Dream Smog Check (0.3 mi) and Montclair Smog Center (0.7 mi). Both are listed further up this page with their ratings and hours.