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

Schedule service

Quantum Auto Sales - Escondido

728 North Escondido Boulevard Escondido, CA 92025

Schedule service

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.

Read all reviews

Ivan Hernández
10/10/2025

Thanks to Quantum Auto Ames of Garden Grove for helping me! 2024 Silverado and all the drivers and staff. Thanks.

Kina's Afro Caribbean Foods
10/6/2025

From the moment I saw the car I wanted for my business and called Quantum Auto, they have been nothing short of exceptional. Got me a good deal, but it was their work ethic, going above and beyond that marked me. They are the best place to shop for your next car and they will work with you till you both are satisfied. Ceasar and Jorges are amazing. I am a forever customer.

Angelina Moncada
10/4/2025

Higinio sales person was knowledgeable and very understanding of what we wanted. He went above and beyond my expectations. Quality but most importantly I admire the dedication this dealer has in helping their customers. As a returning customer they were helpful in all aspects. If you’re looking for a reliable car come to Quantum Auto Sales.

Dinamita OP
10/1/2025

⭐⭐⭐⭐⭐ I want to thank Aarón Ruiz for the excellent service he provided me at Quantum. From the very beginning, he was very professional, clear, and honest with all the information about the vehicle. He instilled confidence in me, patiently answered all my questions, and helped me find the perfect car for me. The process was quick, transparent, and hassle-free. I highly recommend working with Aarón if you're thinking about buying a car; his commitment to his customers is truly evident! 🚗👏

Elisa Polania
10/1/2025

Excellent service from Aaron Ruiz at Quantum. He was very professional, transparent, and friendly throughout the entire purchasing process. 100% recommended.

Carlos Rodríguez
9/28/2025

I had an excellent experience at Quantum From the moment I walked in, the staff was friendly, knowledgeable, and never pushy. My sales representative, Higinio, took the time to understand what I needed and found the perfect car within my budget. The whole process—from test drive to financing—was smooth and stress-free. I highly recommend this dealership to anyone looking for a new or used car.

Service centers at Quantum Auto Sales