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    Piedra's Smog Test Only

    4.7 (293 reviews)
    Closed 8:00 am - 6:00 pm

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    Response time

    30 minutes

    Response rate

    100%

    Services - Piedra's Smog Test Only

    Registration services

    Smog check

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    Yan W.

    I took my Nissan car for a Smog Test and this time I had to do it at a STAR Station. I forgot that I had been to Piedra's Smog Test Only a few years ago. They have the Smog check deal for $46.75 +$8.25 State Certification (Total $55) by checking in on Yelp. The price was very reasonable. You can pay by Cash or Credit card (I used Apple Pay). My car was done in about 15 minutes and he gave me a copy of the Smog Check Inspection Report and the certificate has been electronically transmitted to DMV. It was fast and service was friendly. Easy Peasy!

    Example of coupon.

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    Photo of Carol T.
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    4 years ago

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    Silvino P.

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    4 years ago

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    4 years ago

    Excellent customer service. Fast and professional. Appreciate the later hours they are open on weekdays. Will definitely come back!

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    4 years ago

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    4 years ago

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    4 years ago

    First time here! Staff is very friendly! Convenient location, right on Valley Blvd. Highly recommended!!

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    9 years ago

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    4 years ago

    Friendly and fast service. They have a nice big screen 60" tv in the waiting room to keep customer's entertained while waiting.

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    3 years ago

    Last week I did the smog test here, it was very fast, and professional with reasonable prices. Highly recommended!

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    7 years ago

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    Silvino P.

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    4 years ago

    Quick and easy service! Staff is quick to respond and very helpful! Would recommend to anyone in need of a quick smog check

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    4 years ago

    Elvia is friendly and service is fast and awesome. Cozy waiting lounge. Recommend this place

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    3 years ago

    Responded to my quote right away. Walked in with no appointment and was done in 20 minutes. Very quick and polite and a great price.

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    4 years ago

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    3 years ago

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    4 years ago

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    4 years ago

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    4 years ago

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    4 years ago

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    Silvino P.

    Thank you so much Betty for the kind review.

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    3 years ago

    This is my go to Smog test centet for years! Highly recommended! No bs, just ho in, test and done!

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    4 years ago

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    3 years ago

    No hassle and quick. Friendly and professional. Use the Yelp coupon for discounted price. Highly recommended smog service place!

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    3 years ago

    Really great and quick service! Super helpful staff as well, will definitely recommend to a friend!

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    4 years ago

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    4 years ago

    Decided to try another local smog shop based on their yelp special. The lady at the counter was nice and I was done in 25 minutes.

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    4 years ago

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    3 years ago

    A buddy of mine recommended this place to me. The service was quick and easy. I would come back here for all my smog checks.

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    4 years ago

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    4 years ago

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    4 years ago

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    3 years ago

    All in one stop when it comes to smog testing, renewing tags and title name change. Staff was friendly, helpful and knowledgeable.

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    3 years ago

    Fast, friendly, and affordable! Got my smog check done nice and easy. Definitely would reccomend

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    4 years ago

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    4 years ago

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    5 years ago

    Always quick and a great price. I usually don't wait more than 30 mins. I highly recommend

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    4 years ago

    I came here 2 years ago. The service was fast and staffs were professional. Now here I am again for my Smog check.

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    3 years ago

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    4 years ago

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    4 years ago

    I didn't have an appointment but Silvino was able to quickly smog test my car and get me in/out in 15 minutes.

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    Photo of Javier H.
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    3 years ago

    fast and efficient service! was literally done in 20 minutes, will be bringing my family's cars here from now on.

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    Page 5 of 8

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    Review Highlights - Piedra's Smog Test Only

    Fast and reliable tests, they also where able to handle my DMV registration and hand out the tags right there!

    Mentioned in 32 reviews

    Read more highlights

    Walnut Smog Check

    Walnut Smog Check

    4.7
    (182 reviews)

    To avoid price conflict *MENTION ANY COUPON BEFORE SERVICE*…read more My family and I come here to get our smog check done for our car registration. Sam is quick and friendly. I paid $58 which includes the test and certificate. Last year they offered a $10 coupon. I missed this year's coupon of $8 off which expired 2/28/26. I swung by at noon today (Friday) there were 2 customers ahead of me. My car was serviced at 12:21pm and was done at 12:28pm. I paid cash as I believe there's a small fee if you pay with a card. There's a waiting area, but I don't know if there's a restroom. ( I didn't need to use it)

    Walnut Smog Check needs to have clear coupon rules. Let me explain. I found this place on maps and…read moredecided to give them a call, no answer. When we arrived there, we didn't get a greeting in any way. We asked for a smog check and the guy (possibly the owner) stated that we will be next. While we were sitting around, I was browsing around yelp and noticed that this place offers a coupon discount on smog check. It states "must present coupon prior to service". When he pulled up with a paper for a signature, I mentioned this discount to him and he told me that I needed to show him that when I came in. It doesn't specifically state on the coupon that I needed to show the coupon when I come in. Plus, he didn't even start the service on my car yet. He was really rude about it after and told me he is losing money if he decided to give me the promotion and he can't just adjust the price after printing out the paper. There was also no apologies. If he wants to do business correctly, he needs to own what is said on the coupon and not just change it last minute. I just felt bad vibes throughout this experience and left with a sour taste in my mouth. I ended up paying almost $60 for this smog check which I could've done for cheaper at another place. The service was fast though. That was the only thing good about it. I will not be coming back to this establishment.

    Patrick's Auto Center

    Patrick's Auto Center

    4.7
    (381 reviews)

    My car needed both low beams replaced, an oil change and a tune up. Matt was quick to provide me…read morewith a quote that was reasonable. Scheduling the appointment was easy. Brought my car in, went over some paperwork and was told I'd be contacted once the inspection was complete. Sure enough Matt called me to let me know there were some items found during inspection and which ones needed to be addressed right away. After agreeing to the updated quote they got to work. I came back to the shop prior to being told my car was ready, and I think there may have been a delay in getting parts needed (dropped the car off at 9am, wasn't done until 4pm). Other than that, the quoted price is what I paid, there wasn't any pushing to buy a service that wasn't needed. I will definitely be bringing my car back for the additional work needed.

    I requested a quote through Yelp and my request was sent to multiple auto shops. I chose this…read morecompany based on location and called ahead to confirm they could do more than just read basic codes. I had already done my own diagnostics and knew the car was running rich. I had ruled out the upstream O2 sensor, catalytic converter (both new), MAP sensor, and fuel injectors. I explained all of this to Matt before bringing the car in. He assured me they could perform deeper diagnostics with their equipment. After dropping off the car, Matt called and told me they had "confirmed" exactly what I had already told them, and that the next step would be pulling spark plugs--for an additional fee. At that point, I decided to go elsewhere. What I don't understand is why I was still charged the full $85 diagnostic fee, plus a $4 hazardous materials fee and $3 shop supply fee. Plugging a car into a diagnostic scanner does not generate any hazardous waste--no fluids are drained, no chemicals are used, and no parts are replaced. There's nothing about a basic scan that would justify a hazardous materials charge. That kind of fee typically applies when disposing of things like oil, coolant, or other regulated waste, none of which occurred here. In the end, I paid $92, wasted time and gas, and learned nothing new. The most concerning part was Matt admitting he didn't even know spark plugs would need to be checked as part of further diagnosis.

    Piedra's Smog Test Only - smog_check_stations - Updated June 2026

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