Quick service and appointment on my 2018 car. Fair pricing (not the highest or lowest)…read more Friendly service.

Best smog experience ever. Highly recommend. Super helpful. Reasonable price. Don't even bother…read moregoing anywhere else.

Im so glad I called this place! I needed a smog check and my regular place was down for a couple…read moreweeks. So I did a quick google search and gave this place a call. The advisor that answered the phone was so nice, and said come on down! No appointment needed. I must have driven by this place a million times in the past. They have a nice waiting room with plenty of seating, front door open for fresh air, both advisors working inside super nice and helpful. He took my keys and started on my truck right away, which I definitely wasn't expecting! He gave me a time frame before I even had to ask! I hung out and played games on my phone. Totally chill in here. . Anddddddd they have a $10 smog coupon on their website they let me use. Overall, awesome experience! I'll absolutely be back and recommend these gentlemen! Thanks guys!

Brought in my Mazda for a smog check. I was able to call and get a same day appointment which was…read moreonly 30 mins for my 2017 Mazda CX-5. I like the location bc I was able to walk to the stores in the plaza while waiting. Service and price was good!

10 out of 10 stars the crew aint playing all business when…read moreit comes to fixing cars got my front brake pads rotors done on my bmw treated with respectfully and foremost no up selling had me out there in under a hour. if you want a trusted mechanic this is the spot . thank you team you guys did and outstanding job will be back. 1-30-26.

I called at 2:30 and asked if I could come within 15 mins for a smog. Was told as long as I arrived…read morewithin 15 mins, I could have my car smogged. Arrived about 13 minutes later and was told I would have to come back tomorrow. Don't have me waste my time driving over if you're not going to honor what you tell people.

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!

Guys are great. Super fast and responsive over the phone. I had just booked a 9 AM appointment on a…read moreFriday. I came in at 8:45 AM and the bro here got me out the door at 9:03 AM. My first time at new location. Way bigger and nicer.

Star Smog has excellent customer service. I arrived about 15 min before my appointment and I was in…read moreand out in no time. I would definitely recommend Star Smog.

I recently came in for a smog test and was helped by Rita at the front desk. Very nice and helpful!…read more Unfortunately, my car did not pass the initial test however, I was very pleased to learn that you are able to accommodate me with a cheaper price when I return for a retest. The service was quick, professional, and offered at a great price. I will definitely be coming back here in the future.

I had expressed a window of time i would be by, and ended up being being a bit late…read more i didn't have to wait e 5 minutes, until my car was in the bay, and the entire process was done within 15 minutes from the time i arrived. Sam was so pleasant and helpful! i missplaced my phone and he called it and i had it back in hand immediately. he had offered a coupon and remembered that when he was checking me out. he we far and above what i have experienced at other places. I will definitely be back next time i need a star smog! 5*****

Very helpful during the week. The technician went out of his way to help…read more Forget Saturday service.

Clayton auto services has been extremely helpful. I have taken my cars to them multiple times; they…read moreare quick, do high quality work, and are very reasonably priced! If you want quality work at a great value, go to Clayton auto service!

I've been coming to Clayton Auto Service for about 2 years now and have been very pleased with the…read morequality of work performed here. I need my car for work and there was a time it was disabled by a failing alternator. I stressed to Irfan and his team that I needed my car repaired quick. Irfan was receptive to this and really went above and beyond to get it repaired and in a timely manner. On a separate occasion, they fixed a radiator leak, replaced my catalytic converters, and did my smog testing. The whole process was smooth and professional. They were honest, efficient, and did quality work. I'll definitely be coming back for future repairs and highly recommend them to anyone looking for a trustworthy auto shop.

Took my friend to get her car smogged a few days ago and it was finished within 45 mins. Quick…read moreservice and great customer service! Thank you!

Behind Magoo's and alllllll the way down. Two cars in front of us, and we were still in and out…read morewithin 30 minutes. Coupon on their website, didn't even need to print it out, just showed it on my phone, no problem. All in all--with a car newer than 2000 and the coupon--it was under $70, certificate and sending data to DMV included.

Elite craftsmanship, honest leadership, and true car people…read more This shop is the definition of how an automotive business should be run. Sami, the owner, brings a level of experience and integrity that's rare today. You can tell immediately he's not interested in shortcuts -- only in doing the job correctly, responsibly, and with long-term ownership in mind. That mindset flows through the entire operation. Amal is equally impressive. She's professional, knowledgeable, and incredibly organized, making communication smooth and transparent from start to finish. Together, they've built a shop that runs efficiently while still treating every car with genuine care and respect. They previously handled a major drivetrain project for me (BMW E38 M62TU swap), and the execution was flawless -- clean work, fair pricing, and no surprises. That level of trust is hard to earn. Because of that experience, I'm now confidently bringing them another special vehicle for a full recommissioning. I wouldn't do that if there were even the slightest doubt. If you're an enthusiast, collector, or simply someone who values honest work done right the first time, this is the shop you want. Sami and Amal run an operation that sets the standard. ( Sami also has a pristine Carrera 993 air cooled ) Highly recommended.

I can't say enough good things about Sami & his mechanics. I'm always nervous going into shops as a…read morewoman, but Sami treated me like I was his own daughter. I brought my car in for a screeching sound in my front brakes & they took me in immediately, fixed the issue & made sure my car was safe before they put me back on the road. Unbeatable service! I am forever grateful & will remain a loyal, returning customer. Thank you, Sami & team! Bless you all!

The work is done fast, prices are fair, and the atmosphere is friendly. I highly recommend this…read morestar smog garage to anyone and for any vehicle.

Ok... down to the wire, and it's time for the smog check. Went to my normal site... they couldn't…read morefit me in. A friend recommended this place, and I'm extremely grateful. I've used the gas station before, but never realized there was a smog station in the back .The entrance looks sketchy, so I was a little bit leery, but once back there. Mr. Loc helped me out. He was great!! The car had just come from the shop and they did a shoddy job. He showed me the problems, which affected the computer hook up. He made needed adjustments (definitely above and beyond) and walked me through the review. I appreciated his exceptional service. The value is normal price and overall, it will be my new location to get my smogs done. Thank you Loc I really appreciated your help, Sharine