Performance Smog

Yes. Performance Smog 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. Performance Smog 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.

Performance Smog is open Monday 8 AM to 6 PM; Tuesday 8 AM to 6 PM; Wednesday 8 AM to 6 PM; Thursday 8 AM to 6 PM; Friday 9 AM to 5 PM. Closed Saturday and Sunday. Hours can change on holidays, so call ahead if you are cutting it close.

Yes. Performance Smog accepts walk-ins, so you can drive in without booking ahead.

Performance Smog accepts Cash, Credit Card.

Performance Smog has held a BAR smog license since 2005. You can verify the license status at bar.ca.gov.

Performance Smog 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 (209) 579-8378 for a quote.

Performance Smog does not take online bookings here, but walk-ins are welcome. Call (209) 579-8378 to check the wait.

Staff at Performance Smog 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 Performance Smog 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 Modesto are Stanislaus Smog & Repair Inc (0.6 mi) and Smog Dynamics (0.9 mi). Both are listed further up this page with their ratings and hours.