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    Diamond Bar Auto Service

    4.7 (29 reviews)
    Open 8:00 am - 5:00 pm
    Updated 2 months ago

    Services - Diamond Bar Auto Service

    Auto maintenance

    Oil changes

    Auto repairs

    1 More Service

    Routine automotive maintenance

    Diamond Bar Auto Service Photos

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    Recommended Reviews - Diamond Bar Auto Service

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    Quality is out of this world for the honest price, I called in and in 5 minutes he took me in and assisted me with my oil change! Great work, definitely recommend to anyone around the area!

    Diamond Bar Auto Service, Brea Canyon Rd.
    Carolyn K.

    What can I say about Choi & his wonderful Diamond Bar Auto Service? They both rock our world! I've been taking my cars to him for service and repair since 2005, and I am so blessed to have discovered his business! My former landlord referred me to him, and for that I will be forever grateful! He is very honest, and does fantastic work on all vehicles. His assistant mechanic, Taiwan, is great too, and they are both very pleasant to all. He is not the closest mechanic near L.A., but I do not mind the drive, as the piece of mind he offers is priceless these days! Thank you, Choi for always being so good to me, my Toyota & my former Acura. You are the Best! :)

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    Photo of Matt B.
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    10 years ago

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    1 year ago

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    11 months ago

    Oil change and oil leak check up. Super nice guy and fair prices! Come by the mechanic Is an honest guy

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    1 year ago

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    Photo of Ryan D.
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    1 year ago

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    2 years ago

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    2 years ago

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    3 years ago

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    Photo of Afraaz A.
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    2 years ago

    Honest, good mechanic with great pricing. Limited English but the job gets done honestly

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    Photo of J C.
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    2 years ago

    Amazing service amazing price amazing people. Highly reccomend for any work needed. Always leave happy with nothing negative to say

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    3 years ago

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    5 years ago

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    8 years ago

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    4 years ago

    Itook my car in for oil change. The price is very fair during high inflation. Highly recommend.

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    7 years ago

    I've never met a more honest and knowledgeable mechanic, and thank you for the fair price!

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    13 years ago

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    5 years ago

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    5 years ago

    Always come here for oil change and other car services. Very nice and responsive! Fair price and great service! Recommend!

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    11 years ago

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    7 years ago

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    13 years ago

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    10 years ago

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    8 years ago

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    8 years ago

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    11 years ago

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    13 years ago

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    10 years ago

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    9 years ago

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    Ask the Community - Diamond Bar Auto Service

    Review Highlights - Diamond Bar Auto Service

    Choi gave me an estimate (for free) of about $2300 to fix everything and $1800-1900 without the paint (because I asked).

    Mentioned in 4 reviews

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    Patrick's Auto Center - Stop By For Our New Express Service!

    Patrick's Auto Center

    (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.

    TMC Auto Repair

    TMC Auto Repair

    (193 reviews)

    2018 WRX "UPDATE"... After the leaking issues on the motor rebuild…read more I brought the car back. Martin went above and beyond to fix multiple leaks that came about from the rebuild. I trusted Martin to fix everything and make things right. Martin will do whatever it takes to make this right and have a satisfied customer. I had to have patience and it paid off! The car feels and drives like how it used too! Martin's character to makes things right is why people should come to his shop. He will help out to the best of his abilities to make the customers satisfied. Thank you Martin!!

    5 Stars - TMC Auto Repair in Diamond Bar (aka the place that actually gives a damn)…read more Let me paint you a quick "before and after" picture so funny it hurts: Scene 1: Midas in Diamond Bar, 3:50 PM I roll up with a driver's window that's basically on permanent vacation (stuck halfway like it's trying to ghost me). The guy behind the counter doesn't even glance at the car. Doesn't ask a question. Just grunts, "Yeah, it's the motor." Me: "Cool, wanna pop the door panel and confirm? I'll pay for the diag, takes 10-15 minutes tops." Him: refuses to move, refuses to look, basically treats me like I'm trying to sell him oceanfront property in Arizona. I left wondering if "customer service" is now Latin for "get lost." Scene 2: TMC Auto Repair (literally two minutes away, same day) I used to go to this shop years ago when it had a different name. Now it's TMC and let me tell you -- it should be called TLC because that's exactly what they give you. Walked in frustrated and Martin greeted me like a human being who mattered. He listened to my Midas horror story, laughed with me (not at me), and said, "Let's actually look at it." One of his techs pulled the door panel in like 8 minutes and... drumroll... the motor was bad and there was a broken plastic piece in the regulator (exactly what I told Midas Guy, who apparently moonlights as a psychic but forgot to charge his crystal ball). They got the window temporarily working until the new part arrives, didn't overcharge me, and treated me like I've been their customer for a decade (because I basically have). Moral of the story: Midas Diamond Bar just lost a customer for life in under five minutes. TMC gained a customer for life in under five minutes. Martin and his crew are professional, honest, fast, and actually enjoy fixing cars instead of playing "guess the problem from the lobby." If you're anywhere near Diamond Bar/Walnut area and need work done by people who treat you like family (the good kind, not the dysfunctional Thanksgiving kind), go see these guys. 10/10, will be back the second that part shows up -- and for every oil change, brake job, and random rattle from now until my car retires. TMC, you have my undying loyalty... and my window now goes up AND down. Magic. Show less

    Auto Squad - My new toy would be doing maintenance here also

    Auto Squad

    (85 reviews)

    I was honestly pretty hesitant trying to find a shop I could trust to fix my evaporator and AC…read more It's one of those repairs where you don't want to get overcharged or end up with a quick patch job. I Ended up going with Auto Squad and I'm really glad I did. Matt diagnosed the issue quickly and knew exactly what was going on without any runaround. What really stood out to me was the communication, he kept me updated every step of the way and even sent progress pictures, which gave me a lot of peace of mind. On top of that, pricing was very reasonable for the level of work and transparency. You can tell he takes pride in what he does and actually cares about his customers. Definitely found my go-to shop. I'll be coming back here for any future service!!

    Headline: The Ultimate Shop for Performance Builds and Precision Tuning in LA!…read moreAuto Squad Repair is hands down the best shop in Los Angeles for serious enthusiasts. They've handled my car's transformation from stock to Stage 2, and we are currently pushing for Stage 3 with a new intercooler, downpipe, and ECU tuning. I even trust them with my BMW M8, which they've upgraded with KW V4 suspension and Michelin Pilot Sport Cup 2 tires. Since I love canyon driving, they performed a custom performance alignment specifically tailored for mountain roads. The handling is now absolutely incredible--precise and planted. Whether it's custom wheel fitment or complex performance upgrades, their patience and attention to detail are unmatched. I also do all my routine maintenance and oil changes here because the prices are fair and the mechanics are extremely meticulous. The owner is a great person who truly cares about cars. If you're in LA and want your car done right, come to Auto Squad!

    Diamond Bar Auto Service - autorepair - Updated May 2026

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