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    Piedra's Smog Test Only

    4.7 (293 reviews)
    Open 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

    Piedra's Smog Test Only Photos

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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 Danny W.
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    21 days ago

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    3 days ago

    The smog check was quick and easy. The value was the cheapest I could find. Would recommend and use them again for a smog check.

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    1 year ago

    Helpful 2
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    24 days ago

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    6 months ago

    Quick and a good service. Was in and out within 15 minutes. Employees were friendly no complaints

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    2 months ago

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    2 years ago

    Helpful 3
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    25 days ago

    Family owned. Not the most fancy place, but quick and got the job done. Not much parking inside, but enough along the street if needed.

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    28 days ago

    Business owner information

    Photo of Silvino P.

    Silvino P.

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    1 month ago

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    Photo of Kaelynn J.
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    4 months ago

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    2 months ago

    Good service and work they are fast and efficient and super helpful. I recommend them they did my smog and registration

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    7 months ago

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    1 year ago

    Business owner information

    Photo of Silvino P.

    Silvino P.

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    7 months ago

    Fast and friendly service. Did a great job on the smog check. If you need a quick inspection Piedra's is the place to get it done.

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    1 year ago

    Helpful 0
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    1 year ago

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    2 years ago

    Helpful 2
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    9 months ago

    I got a smog check here and the staff was really helpful and very quick. Would definitely return

    Helpful 1
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    8 months ago

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    6 months ago

    Very quick and make sure you show the coupon ahead of time for great deal. Definitely recommend this place and was worth it

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    2 years ago

    Helpful 8
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    10 months ago

    Helpful 0
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    5 months ago

    Service was quick and got a decent price for my smog check. Definitely would come back

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    1 year ago

    Helpful 0
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    1 year ago

    Quick, quality, friendly service. Nice air conditioned waiting area. Helpful and informative.

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    Photo of Ro B.
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    1 year ago

    Beware! Beware! Better hope car passes. if not, you have 10 days or pay again almost full cost.....

    Business owner information

    Photo of Silvino P.

    Silvino P.

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    Photo of Che L.
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    9 months ago

    Service was quick, easy and affordable. I called the same day to verify they were able to do a smog check before I came in.

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    8 months ago

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    4 months ago

    great service, in and out within 30 minutes..always come here when it's time for a smog.

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    Photo of Marc
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    1 year ago

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    Photo of Jay Y.
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    1 year ago

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    Photo of Denise R.
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    2 years ago

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    9 months ago

    Great service! Got me in and out quick! Friendly staff. Eva was great! I'll be coming back

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    Photo of Stu M.
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    8 months ago

    Very friendly, fast and professional! Thank you ! Comfurtable waiting room , TV I recommend this business !

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    8 months ago

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    10 months ago

    Only 1 customer ahead of me. So it was pretty fast. About 25 minutes completed. Pass smog. $69.00 for everything.

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    1 year ago

    Helpful 1
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    2 years ago

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    2 years ago

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    Page 1 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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