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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Josue Merlos
12/13/2025

Thank you so much, Aaron Ruiz! This is the third time my family has been helped to get another great family car, a beautiful Honda Pilot. I recommend him to everyone.

Fernando Gonzalez
12/11/2025

Higinio Lopez es muy Buena persona y muy amable y muy responsable en su trabajo. Muchas gracias por todo.

Jose Miranda
12/11/2025

Great customer service. Very friendly Aaron ruiz was our representative. He did it again made it happen. Good cars. Highly recommend. He will help you out for sure

Andreina madrigal
12/11/2025

Walked in to ask to ask some questions about a car and Higinio Lopez was such a great help and answered all my questions and concerns was very helpful. I highly recommend him if you and in need of a car or just have some questions he is very helpful.

J Madrigal
12/11/2025

Gracias por todo Bien servicio Higinio López

Marisol Marrufo
12/11/2025

Great customer Service. Very friendly. They work with you. Aaron R made it happen again. Thank you for me and my dad get a car. 🚗 I will highly recommend him for your next car purchase.