
Engine Diagnostics & Repair
Full diagnostic testing for check-engine and warning lights, with honest repair recommendations, not upsells.
Honest Auto Repair, Trusted in Moreno Valley
Moreno Valley drivers rely on Diaz Auto Mechanic for straight answers, fast diagnostics, and repairs done right the first time.

Services

Full diagnostic testing for check-engine and warning lights, with honest repair recommendations, not upsells.

Coolant top-offs, leak testing, and repairs like coolant bypass valve replacement for models such as the Toyota Camry.

Fast, accurate diagnosis and replacement of alternators and starters, including same-day emergency repairs.

Thorough inspections that catch dangerous issues like worn ball joints and bushings before they become a hazard.
Photos



We stay past closing until your car is actually fixed.
Our story
We're a family-run auto repair shop on Sunnymead Boulevard in Moreno Valley, and our whole reputation is built on telling customers the truth about their cars, even when that means charging them nothing. When a customer came in worried about an expensive coolant leak, we ran a full inspection, found no problem, topped off the coolant, and sent her on her way at no charge.
We move fast without cutting corners. We've diagnosed a failing alternator on sight, replaced a coolant bypass valve in under an hour at a fraction of dealer pricing, and stayed open past our posted closing time until a stranded out-of-town customer's truck was fixed and safe to drive home.
We also catch what other shops miss. One customer came to us after two separate mechanics overlooked a dangerously torn ball joint, the kind of thing that can cause a driver to lose control. That's the level of inspection every car gets here.
What customers say
“He thoroughly inspected the car, ran multiple tests, and even test drove it. After all that, he found no leaks and confirmed everything was working properly. He simply replenished the coolant—and didn't charge me anything for his time. He was honest, professional, and clearly not trying to take advantage of the situation.”
“Jesse (the owner) diagnosed it immediately. Even showed me a place to get the parts at the best value and did the repair in UNDER 1 hr!! Fast, effective, and a FRACTION of the price that any auto dealer would've charged me.”
“Perfect place, found a super dangerous ball joint tear that both 2 different (separate) mechanics missed and could of potentially caused my entire car to lose control while driving! Forever grateful to them for my safety. My new automotive repair go to!!!”
Serving Moreno Valley, CA.
23550 Sunnymead Boulevard, Suite 106, Moreno Valley, CA 92553
23550 Sunnymead Boulevard, Suite 106, Moreno Valley, CA 92553
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