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Quantum Mobile Mechanic

4.8 (163 reviews)
Closed 9:00 am - 5:00 pm

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Response time

1 hour

Response rate

100%

Services - Quantum Mobile Mechanic

Vehicle battery testing

Check engine light

Engine oil light diagnosis

23 More Services

Auto general diagnosis

Auto noise diagnosis

Tire Pressure Monitoring System diagnosis

Auto no-start diagnosis

Auto vibration diagnosis

Auto diagnosis or inspection

Auto pre-purchase inspection

Auto maintenance

Auto fluids and filters maintenance

Oil changes

Auto repairs

Auto battery or electrical system repair

Auto brake repair

Auto engine repair

Auto HVAC repair

Auto light repair

Auto steering and suspension repair

Auto wheel and tire repair

Auto windows and mirrors repair

Routine automotive maintenance

Transmission leak inspection

Tire rotation

Windshield wiper replacement

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Recommended Reviews - Quantum Mobile Mechanic

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My main concern is that Quantum Mechanics communicated their assessment directly to the dealership and did not properly inspect the vehicle, even though I paid for the inspection. The assessment they gave the dealership described the car as "well-maintained with a few minor issues," which contradicted what I was told: the car needed its power steering fluid changed, new suspension struts, ball joints, engine, and transmission mounts, totaling $2,676.35. Because Quantum Mechanics called these issues minor, the dealership remained firm on its listed price. I don't understand why Quantum Mechanics communicated this directly to the dealership, since I paid for your service, not them. Also, the car had many other issues that they did not mention, like rust, the floorboard, and the dashboard lights. The e-brake sometimes does not engage it also has an oil leak

Engine bay post service
Aiden ..

I found James on Apple Maps for local mechanics, and boy... I got lucky. I called the number on Apple Maps to see about a transmission fluid leak. James answered with a congenial and professional attitude. He came out ASAP to do an inspection and was immediately able to determine that my transmission was fine; however, I had a bad, leaking valve cover. He charged $100 for an inspection, which acted as a discount when I proceeded with the repair. Since the manifold was being removed to access the valve cover, he asked if I also wanted to get my sparkplugs/coils serviced. He didn't try to sell me on any extra services; he was genuinely interested in taking care of my car. I got my sparkplugs replaced, ignition coils replaced, and a full set of fresh valve cover gaskets with parts+labor totaling ~$900. My 2010 Nissan Xterra with 130k miles has been driving great ever since. James is an honest mechanic who has a passion for treating cars right. His prices are extremely fair, and I would recommend him to anyone in the area.

So awesome!! It's mobile service to your convenience and no hassle or waiting.

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2 years ago

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James W.

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1 year ago

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James W.

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1 year ago

Great service, was very helpful and had great customer service! I would definitely recommend John to friends and family!

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James W.

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2 years ago

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James W.

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1 year ago

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James W.

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1 year ago

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James W.

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2 years ago

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James W.

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1 year ago

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James W.

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1 year ago

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James W.

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2 years ago

James was great, friendly and informative. Provided a reasonable quote and stuck to it. Super fast and very professional.

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James W.

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1 year ago

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James W.

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1 year ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

He was very professional. He told me what he was doing while he was making the repairs on my car, I would highly recommend him for repairs.

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James W.

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1 year ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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1 year ago

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James W.

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2 years ago

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James W.

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2 years ago

Really personable and efficient. Will gladly work with again. Solved our battery cable issue.

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James W.

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2 years ago

Wow! Had a problem w/brakes. Fixed in minutes. Excellent service and was on time. Relieved my stress. Awesome Thanks

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James W.

Fast and convenient is what we aim for!

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1 year ago

Quality of is awesome. Customer service is amazing. guy is legit. I would recommend him to everybody.

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

James did an awesome job highly recommend him if you are looking for a trustworthy mechanic. Prices are very reasonable and he comes to you.

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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James W.

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2 years ago

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2 years ago

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James W.

I’m so happy we could service your vehicle to your satisfaction!

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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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Quantum Mobile Mechanic Reviews in Other Languages

Ask the Community - Quantum Mobile Mechanic

I have a 88 Toyota truck that is not getting any electrical power to the dashboard or ignition . I'm not available until evenings after 530pm?

No problem! We charge $125 for a diagnostic.

Hi James. I read you're a veteran Navy guy. Me too. Anyways, I have a 1991 Ford Bronco with a 351 engine. I've been eating batteries so I suspect my alternator is bad. Would I be able to schedule with you to come to my house in Claremont fix?

Of course we can perform a diagnostic for you for a cost of $125. We service the Claremont area. This will include testing your charging system and if you have a parasitic draw we can check that too.… Read more

I was wondering how much it would cost to come out and find out is wrong with my car?

We charge $125 to perform an at home (or anywhere) diagnostic.

Don’t See Your Question? Ask Away!

Review Highlights - Quantum Mobile Mechanic

James diagnosed and explained every part of the repair, gave me options and never pressured us.

Mentioned in 105 reviews

Read more highlights

T & H Automotive Repair

T & H Automotive Repair

(44 reviews)

I went to a tire shop to get new tires and an alignment due to an accident and the tire guy told me…read morehe can't perform a car alignment, because the accident caused damage in parts of my car, and that I needed new parts. So I went to T&H Automotive repair shop to get a second opinion. I always come here for car troubles and I liked their honest service. So I went with them to get a second opinion abt purchasing new car parts. They got my car up and took a look under and they immediately told me my car was perfectly fine. They even drove my car to confirm everything is working. They refered me to just get an alignment. I went to get an alignment and asked the guy if it was necessary to purchase new parts - the guy said not at all. Which just affirmed to me that the two men that work in T&H Automotive repair are knowledgeable and honest to us women :) Highly recommend!!!

Just got my oil change by Felipe. I love coming to this shop! They just got some new owners and…read morethey're super chill, really nice guys and very educated on cars. Felipe is always honest and takes care of my and my partner's cars. He may be new to this location, but I've been trusting him with my cars for years. Daniel and Felipe have a good thing going here. I've seen they have a Pokemon TCG Pocket offer, if you can beat them. These are honest guys with honest prices and you're guaranteed quality service. These guys are the real deal, and they've even got the Dodgers games and so much more to watch to keep you occupied. I know I'll keep coming back to Felipe and Daniel for years to come.

H Car Repair

H Car Repair

(116 reviews)

H car repair was recommended to me by a friend who has her car serviced several times…read more I went in and basically said I need a second opinion Dave, said no problem he looked it over and told me what was wrong with my Honda Accord. He dealt with the warranty Company and got things taken care of. Dave and his wife were friendly and kind to someone who was taken advantage of at the dealership. Thank you Dave and the H car repair team.

Last week my Granddaughter called and asked if I could go with her to the car dealership to have…read moreher car serviced. She has had trouble with the dealership in the past. I live in San Clemente and she lives in La Verne which is about 75 miles away for me, no problem I was at her home @ 8am. I explained to her that I used to have my vehicle serviced at H Car Repair and should give them a try. Ok Grandpa let's go she stated, about 7 minutes away arrived and I let her explain what service she needed and any problems she is experiencing. A very proud Grandpa as she spoke with the owner-manager of the shop. She and Dave agreed to have the work completed. So she and I went to have breakfast and enjoy each other's company which was wonderful to catch up. A couple of hours later her vehicle is ready, Dave brought in the parts replaced into the lobby showing my granddaughter and explaining in detail the process and cost. It was a win win overall H Car Repair has a new customer and Granddaughter now knows that she can go have her car serviced without being taken advantage of at a fair price. 5 STAR SERVICE GRANDPA HAS NOW DONE HIS JOB, THE LITTLE BIRD HAS LEARNED TO FLY ON HER OWN ! Don R.

Quantum Mobile Mechanic - autorepair - Updated June 2026

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