Welcome to Quantum Auto Sales 

Your Trusted Dealership for the Best New & Used Cars in Orange County & San Diego County

Welcome to Quantum Auto Sales, your reliable destination for the best new & used cars for sale in Garden Grove, Santa Ana, and throughout Orange County, as well as Escondido and San Diego County. With convenient locations in Southern California, we proudly serve drivers from Garden Grove, Santa Ana, Orange County, Escondido, and greater San Diego County with a high-quality inventory and an exceptional customer experience.

Wide Selection of New & Used Cars for Sale

Our diverse inventory includes sedans, SUVs, trucks, hybrids, and electric vehicles from trusted brands like Toyota, Honda, Ford, Chevrolet, Nissan, and more. Each vehicle is carefully inspected for safety, performance, and value—giving you the confidence you deserve. If you're searching for the best new & used cars in Garden Grove, Santa Ana, Orange County, Escondido, or San Diego County, Quantum Auto Sales has you covered.

Flexible Financing Options for All Credit Types

No matter your credit situation, our finance team is here to help. We partner with a wide network of lenders to offer affordable financing plans tailored to your budget. Whether you have good credit, bad credit, or no credit, we’ll work hard to get you approved and behind the wheel of a vehicle you love.

A Better, Stress-Free Car Buying Experience

At Quantum Auto Sales, we focus on transparency, honesty, and customer care. We don’t use high-pressure tactics. Instead, we take the time to understand your needs and provide a smooth buying experience—one that has made us a top choice for new & used cars across Orange County and San Diego County.

Visit Quantum Auto Sales Today

Whether you’re located in Garden Grove, Santa Ana, Escondido, Orange County, or San Diego County, our friendly team is ready to help you find the right vehicle for your lifestyle and budget. Visit one of our Southern California locations or browse our online inventory today!