Welcome to On Site Auto Repair!
Auto Mechanic in Rohnert Park, CA — On-Site Auto Repair
Rohnert Park’s trusted mobile mechanic. We come to you — home, work, or roadside — so you don’t have to rearrange your whole day.
What Makes On-Site Auto Repair Different
A lot of shops in the area do solid work. We’re not here to knock them. But on-site service is a different category, and most traditional shops simply can’t offer it.
Here’s what you get when you choose us:
No towing costs. If your car won’t start or something breaks down near Graton Resort, the Ladybug Park area, or anywhere in between, we come to you. No tow truck needed for most jobs.
No shop wait. You stay home. You go to work. You live your life. We handle the repair and call you when it’s done.
Full transparency, every time. California law requires us to give you a written estimate before we touch anything. We do that, and we explain every line item in plain language. No surprises on the final bill.
ASE-certified technicians. Our mechanics hold ASE (Automotive Service Excellence) certifications. That’s the national standard for automotive repair quality. When an ASE-certified tech works on your car, you know they’ve tested and proven their skills, not just picked up a wrench.
Parts and labor warranty. We back our work. If something we repaired isn’t right, we make it right.
A Mechanic That Actually Comes to You in Rohnert Park
Most people dread car trouble. Not because of the repair itself, but because of everything that comes with it. Rearranging your schedule. Finding a ride home from the shop. Waiting in a plastic chair under fluorescent lights for hours. Then getting a call about extra charges nobody warned you about.
We built On-Site Auto Repair to fix exactly that.
We’re a licensed Automotive Repair Dealer (ARD) serving Rohnert Park, CA and the broader Sonoma County area. Our mobile mechanic service brings professional diagnostics and repairs directly to wherever your car is — your driveway in University Park, a parking lot near Sonoma State University, your office by SOMO Village, or anywhere else in the 94928 zip code.
You don’t come to us. We come to you.
If you’re in Rohnert Park, Cotati, Petaluma, Santa Rosa, or Sebastopol and you need a mechanic you can actually trust, keep reading.
Auto Repair Services We Offer in Santa Rosa, CA
Our shop at 363 W 9th St B & C handles a wide range of repairs and maintenance for drivers across Santa Rosa and Sonoma County.
Engine Diagnostics and Check Engine Light
A check engine light means your car is reporting a fault. We connect an OBD-II scanner, read the fault codes, and explain what they mean in plain language. We diagnose the problem first, then tell you what the repair will cost.
Oil Change Service
We do full-synthetic and conventional oil changes. We use the viscosity grade your manufacturer specifies, such as 5W-30, 5W-20, or 0W-20, and we replace the oil filter every time.
Brake Repair and Replacement
Worn brake pads squeak. Worn rotors grind. A soft brake pedal is a warning. We inspect and replace brake pads, rotors, and calipers using OEM-quality and aftermarket parts, depending on your budget.
Battery, Alternator, and Starter Repair
We test your battery with a load tester, not just a voltage check. We also test the alternator and starter, because a failing alternator will kill a new battery quickly.
AC and Heating Repair
If your AC is not blowing cold, we recharge the refrigerant and check for leaks. If your heat is not working, we diagnose the cause and repair it.
Scheduled Maintenance and Tune-Ups
We handle spark plug replacement, belt inspection and replacement, air and cabin filter replacement, fuel system service, coolant flushes, and transmission fluid service. If you are not sure what your car is due for, we look it up by make, model, and mileage.
Tire Rotation and Inspection
Uneven tire wear affects handling, fuel economy, and tire life. We rotate your tires, measure tread depth, inspect the sidewalls, and check the pressure.
Pre-Purchase Inspection
Thinking about buying a used car? We check the brakes, belts, fluids, undercarriage, and suspension, and we run a diagnostic scan for hidden fault codes. Call for current pricing.
Why Santa Rosa Drivers Choose On Site Auto Repair
Free estimates. You know the cost before we start any work.
Same-day appointments available. Call and we will tell you what we can fit in today.
ASE Certified mechanics. Credentialed professionals with real diagnostic tools.
Convenient location. We are in Railroad Square, minutes from downtown Santa Rosa, with shops and restaurants in walking distance while you wait.
Ready to Book?
Call (707) 326-8655 or send us a message with your vehicle and what is going on with it. We will give you a free estimate before we schedule anything.
On Site Auto Repair — 363 W 9th St B & C, Santa Rosa, CA 95401. Serving Santa Rosa, Petaluma, Rohnert Park, Sebastopol, Windsor, Healdsburg, and Sonoma County.
Frequently Asked Questions About Auto Repair in Rohnert Park
Our certified mechanics answer the most common car repair questions to help you stay informed and confident. Explore our FAQs for honest, expert advice trusted by Rohnert Park drivers.
How does on-site auto repair actually work?
It's straightforward. You call or book online, tell us what's going on with your vehicle, and we schedule a time to come to you. Our mechanic shows up with the tools, equipment, and parts needed for your job. We do the work on-site — in your driveway, at your workplace, wherever works for you. We give you a written estimate upfront, get your approval, do the repair, and then you pay when it's done. That's it.
Are mobile mechanics as qualified as shop mechanics?
Yes. Our technicians hold ASE certifications, the same credential you'd look for at any traditional shop. The work we do meets the same quality standard. The only difference is we bring the work to you. We also carry professional-grade diagnostic equipment, including OBD-II scanners, multimeters, and pressure gauges, so we're not cutting corners on the technical side.
What if my car needs a repair that can't be done on-site?
It's rare, but it happens. Some jobs — like major engine rebuilds or certain transmission overhauls — require a lift or specialized shop equipment. If we get to your vehicle and find that's the case, we'll be straight with you. We'll let you know what's needed and help you figure out next steps. We won't charge you for a job we can't finish.
Do I get a written estimate before anything is done?
Yes. Always. California law requires it, and we think it's just the right thing to do. You'll see exactly what we're recommending, why, and what it costs before we start any work. You're in control. Nothing happens without your approval.
Does my warranty get voided if I use an independent mechanic instead of the dealership?
No. Under the federal Magnuson-Moss Warranty Act, your car's warranty cannot be voided just because you chose an independent mechanic for service and maintenance. The dealership can require you to use them for specific warranty repair work, but routine maintenance and repairs don't have to go through them. Many Rohnert Park drivers pay significantly more at dealerships without any warranty benefit for doing so.
How much does an on-site mechanic cost compared to a shop?
People often assume mobile service costs more. It usually doesn't — and when you factor in what you save on a tow truck, a rental car, or a day off work, it's almost always less. We keep our pricing fair and transparent. The written estimate you get before we start is the price you pay. No shop fees. No "environmental charges" buried at the bottom.
What areas near Rohnert Park do you cover?
We cover Rohnert Park and the surrounding Sonoma County communities, including Cotati, Petaluma, Santa Rosa, Sebastopol, and Novato. If you're not sure whether we reach your location, just give us a call and we'll tell you straight.
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