N Service Auto Repair & Service

No. N Service Auto Repair & 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. N Service Auto Repair & 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.

N Service Auto Repair & Service is open Monday 7 AM to 3:30 PM; Tuesday 7 AM to 3:30 PM; Wednesday 7 AM to 3:30 PM; Thursday 7 AM to 3:30 PM; Friday 7 AM to 3:30 PM. Closed Saturday and Sunday. Hours can change on holidays, so call ahead if you are cutting it close.

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

N Service Auto Repair & Service accepts Cash, Credit Card.

N Service Auto Repair & Service has held a BAR smog license since 2015. You can verify the license status at bar.ca.gov.

N Service Auto Repair & 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 (925) 932-1740 for a quote.

N Service Auto Repair & Service does not take online bookings here, but walk-ins are welcome. Call (925) 932-1740 to check the wait.

Staff at N Service Auto Repair & 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 N Service Auto Repair & 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 Walnut Creek are Walnut Creek Honda (0.5 mi) and Smog Star Express (0.5 mi). Both are listed further up this page with their ratings and hours.