Mr Smog & Muffler

No. Mr Smog & Muffler is not STAR certified. If your DMV renewal notice says "STAR Station Required," you will need to visit a STAR certified station instead.

No. Mr Smog & Muffler 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.

Mr Smog & Muffler is open Monday 9 AM to 6 PM; Tuesday 9 AM to 6 PM; Wednesday 9 AM to 6 PM; Thursday 9 AM to 6 PM; Friday 9 AM to 6 PM; Saturday 10 AM to 2 PM. Closed Sunday. Hours can change on holidays, so call ahead if you are cutting it close.

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

Mr Smog & Muffler accepts Cash, Credit Card.

Mr Smog & Muffler has held a BAR smog license since 2007. You can verify the license status at bar.ca.gov.

Mr Smog & Muffler 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) 469-0678 for a quote.

Mr Smog & Muffler does not take online bookings here, but walk-ins are welcome. Call (209) 469-0678 to check the wait.

Staff at Mr Smog & Muffler 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 Mr Smog & Muffler 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 Stockton are Multi Auto Service & Smog (0.3 mi) and California Auto Tech (0.3 mi). Both are listed further up this page with their ratings and hours.