01
General Auto Repair & Diagnostics
Straightforward diagnostics and repair work from a team that explains what's wrong and what it costs before touching your car.
Honest Auto Repair in Ontario, CA
Honest Auto Repair, Done Right the First Time
Rick and his team diagnose the problem fast, explain it clearly, and get you back on the road at a fair price.
4.8★
Google Rating
76
Google Reviews
<30 min
Tire Fix Time
Services
Everything we take on.
02
Tire Repair & Replacement
Flat tire and puncture repairs handled fast, often in under thirty minutes, so you can get back on the road.
03
Propane
Propane service offered on-site, alongside full auto repair.
Photos
A look around.
Honest diagnostics, fair pricing, treated like family.
Our story
A Family-Run Shop Built on Trust
Diamond Auto Center is a family-run shop in Ontario, run by Rick and his son alongside a team that includes Mikey, Scott, Marcos, and Brian. Customers keep coming back because the diagnosis is honest, the pricing is fair, and the work gets done right the first time.
We treat every car like it belongs to family. When one customer accidentally left her wallet in the glove compartment, it was still there, untouched, when she picked up her keys. That is the standard we hold ourselves to on every job, from a flat tire to a full diagnostic.
Whether you need a quick tire fix or a deeper repair, we walk you through what is wrong, what it costs, and get you back on the road quickly.
- Family-owned shop
- Transparent, fair pricing
- Same-day tire repairs
- Trusted across the Inland Empire
What customers say
“When you want professional work done efficiently, fast, and at a great price, I highly recommend Diamond Auto Center. Mikey, Scott, and Marcos jumped on my vehicle like a NASCAR pit crew! They've earned a lifetime customer.”
“This is the most reliable and honest mechanic in the Inland Empire. Rick, his son, and the whole team proved knowledgeable and trustworthy in every diagnosis and repair, and the pricing was fair and transparent.”
“I accidentally left my wallet in the glove compartment when I dropped my car off. When I picked it up, my wallet was still there untouched. It's hard to find a mechanic you can truly trust, but this shop definitely earned my trust.”
Get it booked.
Serving Ontario, CA, Inland Empire.
(909) 218-7600
Get directions →105 W California St, Ontario, CA 91762, USA
Hours
Closed now- Monday
- 8:00 AM – 5:00 PM
- Tuesday
- 8:00 AM – 5:00 PM
- Wednesday
- 8:00 AM – 5:00 PM
- Thursday
- 8:00 AM – 5:00 PM
- Friday
- 8:00 AM – 5:00 PM
- Saturday
- 8:00 AM – 4:00 PM
- Sunday
- Closed
105 W California St, Ontario, CA 91762, USA
Get directions →