Fast courteous service. I arrived before the shop opened and had 2 people ahead of me. I only…read morewaited about half an hour for my Smog.

I was hoping to have utilized services from this location "based" on reviews that I read. But upon…read moremy arrival, I did not notice much activity at the location. So I proceeded to walk up to the door to only find out that the doors were locked., I viewed the business hours on the door, which reflected open. I then reached out to their "text" line nicely asking about their hours and was informed shortly after (with no greeting) that their machine was down for the day. And expected to be back up and running the following afternoon. So I had to take my business elsewhere.

Response time was quick. The service was quick and easy…read more Got my car smogged and processed in about 15 minutes.

Quick service, good value. Professional and helpful with the process. Convenient location and…read moreeasy access

Amazing service! Love this business for doing all our smogs to all of our cars, that we have even…read morereferred our neighbors to come here. The Tech is quick and the doing the smog and efficient Please keep this business IN BUSINESS by reading my post and bringing in your cars to get your smogs done here!!!! We bought our Acura RSX Type-S, my Honda S2000 and our Ford Expedition and brought our neighbors brought their Jeep Cherokee.

If this place is close to you, it's a great deal. Ask for the Yelp pricing. It was $30 less than…read moreother competitors. I only found out by doing one of those Yelp quote requests (from various competitors, did it sheerly by accident trying to make an appointment at a prior place I went to). It's a no frills place. No appointments. Walk-ins only. We were lucky in that the person before us was just finishing up when we arrived so we didn't have to wait too long. The waiting area is a few fold-up chairs in a square concrete area that is quite sloped.

It was $73 total in December 2025 with a $15 off coupon. It's near the Auto Center freeway exit,…read moreconducive to warming up your engine on the way there. There were 2 cars in front of us when we went, and they still got us out of there quicker than most smog joints. Waiting room is clean, if stark. There's a bathroom if you need it. But man, the music was SO LOUD. Like, the receptionist was yelling over the music, "OKAY, SIGN HERE!" and when she grabbed the remote, I presumed it was to finally turn the music down. Nope. She just changed it from '00s pop to contemporary country. There's an option for a tip at checkout, which always makes things nice and awkward, regardless of tip level.

This place has five stars for a reason!…read more I was in and out before I was able to finish a chapter of my book. Hands down the FASTEST service I've ever experienced. Friendly, efficient, thorough. They had multiple employees ready to jump in to ensure your car is handled with speed. Clean facility. Location is spot on. Anything car related always riddles me with anxiety, but they took the stress out of this. I will drive the extra miles to return here for my smogs. Definitely will be recommending to friends and family members. THANK YOU!

I would not recommend these people there are overpriced and very rude when it comes down to Service…read moreI would never recommend any of my friends or family to come here at all. Spend your money elsewhere.

Had a great experience dealing with Jr. at Gumaro's. He was helpful and honest and everything he…read moresaid would happen did. I left with my car all fixed and no crazy surprises. Will definitely go back for any future car needs.

Excellent, fast, and friendly service! Called on a Tuesday around 12:40pm to book a same day…read moreappointment for a Smog check and was able to get one. I needed to get a Smog certification to get my car registration renewed, and Walnut Creek Smog made the process easy! Check in was quick, and the Smog check was completed in 15 minutes as promised. I've been here twice now, and I'll definitely be back in the future!

Always friendly, great service and quick. All our smogs are done here for years. They moved to a…read morenew location. It's a bit crowded and the lounge is tiny but will do for the short wait.

Great service! Got me right in with a short wait and no appointment. They honored the $25 off…read morecoupon after check in here on yelp.

I do not recommend A Star Smog at all! They are rejecting the Groupon vouchers. When I got there…read morethere was a man already frustrated because the employee didn't want to accept his Groupon deal. I got a Groupon deal and the employee was giving us none sense excuses like if we were stupid. I just wasted my gas and time going there. He refused to do the smog check to my car! I am so disappointment!

Stopped in to get my car smogged. They're always professional. There's a small waiting room with a…read morefew chairs, but honestly they're so quick there's no need to sit down. The price is fair as well. Overall, you should definitely go to Smog Guys to get your vehicle smogged. Great all around service.

Quick and easy - service great and at a good price. I go there with all my cars. No reason to look…read moreany further. Just had my 2005 Ford T-Bird smogged and again: all good.

This place is very honest they do quality work I would recommend to everybody let's book ahead…read morebecause they're very busy. It's not easy to find a good mechanic.

Extremely fast and friendly I will make this my smog spot from now on!!! Very good, thank youread more

They quoted me $120 for a smog check on a1999 mustang, other place charge me $85. I will not…read morerecommend this place.

They do not honor their discounted prices. They tack on fees which increases the smog check price…read moreon their Facebook from $39.95 to $60+.