Driven by Trust. Powered by Experience.

At Quantum Auto Sales, we’re more than just a used car dealership—we’re your local automotive partner committed to honesty, quality, and customer satisfaction. With convenient locations in Garden Grove, Santa Ana, and Escondido, we've proudly served the Southern California community for years by helping thousands of drivers find dependable, affordable vehicles they can trust.

Our Legacy of Quality

From day one, we’ve built our business on a foundation of transparency, integrity, and quality. Every vehicle on our lot is hand-selected, thoroughly inspected, and maintained to meet high standards—because we wouldn’t sell a car we wouldn’t drive ourselves.

Inventory That Fits Every Lifestyle

Whether you’re looking for a fuel-efficient sedan, a family-ready SUV, a hardworking truck, or an eco-friendly hybrid or EV, our diverse inventory offers something for everyone. No matter your budget or needs, we’re here to help you find the right vehicle at the right price.

Customer-Centered, Every Step of the Way

What sets Quantum apart? Our people. Our experienced and friendly team is dedicated to making your buying experience easy and enjoyable—from your first test drive to your final paperwork. We offer flexible financing options, a no-pressure sales approach, and helpful guidance so you can buy with confidence.

Explore our inventory

Blue 2018 Mazda CX-5 Grand Touring Sport Utility 4D for sale in Garden Grove, CAPhotos of 2018 Mazda CX-5 Grand Touring Sport Utility 4D for sale in Garden Grove, CA at Quantum Auto Sales - Garden GroveAnother view of 2018 Mazda CX-5 Grand Touring Sport Utility 4D for sale in Garden Grove, CA at Quantum Auto Sales - Garden GroveMore photos of 2018 Mazda CX-5 Grand Touring Sport Utility 4D at Quantum Auto Sales - Garden Grove, CAMore photos of 2018 Mazda CX-5 Grand Touring Sport Utility 4D at Quantum Auto Sales - Garden Grove, CA
Stock # 35692
Grand Touring Sport Utility 4D
69,019 miles
$20,995
Est. Payment
$347/mo
Black 2020 Ram 1500 Classic Crew Cab Warlock Pickup 4D 5 1/2 ft for sale in Santa Ana, CAPhotos of 2020 Ram 1500 Classic Crew Cab Warlock Pickup 4D 5 1/2 ft for sale in Santa Ana, CA at Quantum Auto Sales - Santa AnaAnother view of 2020 Ram 1500 Classic Crew Cab Warlock Pickup 4D 5 1/2 ft for sale in Santa Ana, CA at Quantum Auto Sales - Santa AnaMore photos of 2020 Ram 1500 Classic Crew Cab Warlock Pickup 4D 5 1/2 ft at Quantum Auto Sales - Santa Ana, CAMore photos of 2020 Ram 1500 Classic Crew Cab Warlock Pickup 4D 5 1/2 ft at Quantum Auto Sales - Santa Ana, CA
Stock # 35678
Warlock Pickup 4D 5 1/2 ft
64,035 miles
$29,995
Est. Payment
$491/mo
Blue 2017 GMC Sierra 1500 Crew Cab SLE Pickup 4D 5 3/4 ft for sale in Santa Ana, CAPhotos of 2017 GMC Sierra 1500 Crew Cab SLE Pickup 4D 5 3/4 ft for sale in Santa Ana, CA at Quantum Auto Sales - Santa AnaAnother view of 2017 GMC Sierra 1500 Crew Cab SLE Pickup 4D 5 3/4 ft for sale in Santa Ana, CA at Quantum Auto Sales - Santa AnaMore photos of 2017 GMC Sierra 1500 Crew Cab SLE Pickup 4D 5 3/4 ft at Quantum Auto Sales - Santa Ana, CAMore photos of 2017 GMC Sierra 1500 Crew Cab SLE Pickup 4D 5 3/4 ft at Quantum Auto Sales - Santa Ana, CA
Stock # 35679
SLE Pickup 4D 5 3/4 ft
73,081 miles
$26,995
Est. Payment
$462/mo
Red 2023 Nissan Rogue SV (2023.5) Sport Utility 4D for sale in Escondido, CAPhotos of 2023 Nissan Rogue SV (2023.5) Sport Utility 4D for sale in Escondido, CA at Quantum Auto Sales - EscondidoAnother view of 2023 Nissan Rogue SV (2023.5) Sport Utility 4D for sale in Escondido, CA at Quantum Auto Sales - EscondidoMore photos of 2023 Nissan Rogue SV (2023.5) Sport Utility 4D at Quantum Auto Sales - Escondido, CAMore photos of 2023 Nissan Rogue SV (2023.5) Sport Utility 4D at Quantum Auto Sales - Escondido, CA
Stock # 35663
SV (2023.5) Sport Utility 4D
24,663 miles
$25,995
Est. Payment
$426/mo

Visit one of our used car dealerships conveniently located in Garden Grove, CA, Santa Ana, CA, & Escondido, CA: Near Irvine, Oceanside, and Anaheim.

Quantum Auto Sales - Garden Grove


Street address:
13831 Harbor Boulevard
Garden Grove, CA 92843

Phone:
Sales: (714) 265-0240

DaySales Hours
Monday9:00 AM - 9:00 PM
Tuesday9:00 AM - 9:00 PM
Wednesday9:00 AM - 9:00 PM
Thursday9:00 AM - 9:00 PM
Friday9:00 AM - 9:00 PM
Saturday9:00 AM - 9:00 PM
Sunday10:00 AM - 8:00 PM