Auto service centers in SoCal | Quantum Auto Sales

Certified Auto Service at Quantum Auto Sales – Garden Grove & Escondido

At Quantum Auto Sales, we go beyond selling quality vehicles—we help you keep them running like new. Our certified service centers in Garden Grove and Escondido are equipped to handle everything from routine maintenance to advanced diagnostics and repairs. Whether you purchased your car from us or elsewhere, you can count on our expert technicians to deliver honest, professional service every time.

Quantum Auto Sales - Garden Grove

13831 Harbor Boulevard Garden Grove, CA 92843

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Quantum Auto Sales - Escondido

728 North Escondido Boulevard Escondido, CA 92025

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Reliable Auto Services

Whether you're due for scheduled maintenance or need repairs you can trust, Quantum Auto Sales Service Centers are your local destination for professional, customer-focused care.

Oil Changes

Keep your engine running smoothly with regular oil and filter changes

Tire Rotation

Extend the life of your tires and improve handling with routine rotations

Engine Diagnostics

Our advanced diagnostic tools pinpoint issues quickly and accurately

Transmission Repair

Expert service to keep your transmission performing efficiently

Brake Replacement

Ensure your safety with high-quality brake inspections and replacements

Factory-Trained Technicians

Certified professionals providing expert care for your vehicle

What Drivers Are Saying

Real feedback from real customers who trust Quantum Auto Sales for quality service and dependable care. See why drivers across Southern California keep coming back to our Garden Grove and Escondido service centers.

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Food lover
8/21/2025

Best experience with Cesar . Always quick to respond to any questions I have. Really happy with my car . Ten thumbs up !

Susaj Q. Roadhouse
8/15/2025

From a 2002 Chevrolet prism to a 2017 Toyota Prius. I really have to give it the team here at Quantum Auto Sales. They matched me with the right vehicle, at the right price, on the right day, with the right line. I couldn’t be more happier. I shared a tons of photos with my friends and family and look for others who are in need of a good quality vehicle, for the right price. I also got a good credit boost from my credit line. +15 points instantly. Thanks Quantum Auto Sales, You Rock!

Yuli Salas
8/09/2025

Higinio López: Excellent service, excellent customer service, and above all, excellent advice! As a first-time car buyer, I was delighted with all the support provided.

Martha Fuentes
8/08/2025

Aaron Ruiz, our sales representative, was incredibly nice and professional. He made us feel comfortable throughout the entire process and met all of our expectations. We left with a vehicle that I feel confident will keep my little brother safe on the road. Edgar, the assistant manager, also made the process easy and even fun! Highly recommend their team.

Adolfo Vivar
8/04/2025

Definitely recommend you guys coming to Quantum Auto Sales in Garden Grove if you are looking for a nice truck or a daily commuter car! Came in to see an F-150 yesterday afternoon that I saw online. Cesar was the Car Salesman that help me see the truck and to purchase it! I was able to drive it off their lot within a few hours! Definitely will be coming again in the future with them! Gracias a Quantum Auto Sales!

Samuel GONZALEZCANO
7/20/2025

Higinio was very kind, he treated us very kindly.

Service centers at Quantum Auto Sales