Welcome to On Site Auto Repair!
Auto Repair in Sebastopol, CA — On-Site Auto Repair Comes to You
Your car broke down near The Barlow. Your check engine light came on during your morning commute along Gravenstein Highway. Or maybe you’ve been putting off that brake job for weeks because you can’t find the time to drop your car off and wait around.
That’s exactly what On-Site Auto Repair is here for.
We’re a locally owned auto repair shop serving Sebastopol, CA and the surrounding Sonoma County communities. What makes us different from every other shop on the list? We come to you. No tow truck. No waiting room. No ride-share to the office. Our mobile mechanic van brings the repair to your driveway, your workplace, or wherever your car is sitting right now.
A Note About Driving in Sebastopol
West Sonoma County roads are genuinely harder on vehicles than most people expect. The tight curves on Bodega Highway stress your brakes and suspension. The morning fog belt near Sebastopol accelerates corrosion on battery terminals and electrical connections. Farm roads and vineyard driveways put extra wear on tires and alignment.
We mention this not to scare you — but because understanding your driving conditions helps you make smarter maintenance decisions. A car that does daily runs up and down Gravenstein Highway needs different attention than one that only sees flat freeway miles.
We know this area because we’re part of it. That local knowledge makes us better at what we do.
Auto Repair That Works Around Your Life
Most people in Sebastopol don’t have time to sit at a shop all day. You’ve got kids to pick up from school near Ragle Ranch Regional Park. You work in Santa Rosa and need your car ready by morning. You’re a small business owner who can’t afford downtime.
We get it. That’s why we built our service around the way real people live.
On-Site Auto Repair handles everything from routine oil changes and brake replacements to engine diagnostics, electrical problems, and California smog repairs — right where your car sits. We serve Sebastopol, Graton, Forestville, Cotati, Rohnert Park, Petaluma, Santa Rosa, Windsor, and even out toward Bodega Bay.
If you’re in West Sonoma County, we’ve probably already helped someone on your block.
What We Fix
Our ASE-certified technicians work on domestic vehicles, foreign vehicles, trucks, SUVs, passenger cars, and hybrids. Here’s what we handle day in and day out:
Engine Repair & Diagnostics
That check engine light could mean a dozen different things. We use OBD-II scan tools and advanced diagnostics to find the real problem fast — not guess at it. Whether it’s a failing oxygen sensor, a misfiring cylinder, or something more serious, we’ll tell you exactly what’s wrong and what it’ll cost before we touch anything.
Brake Repair & Replacement
Sebastopol’s winding roads along Bodega Highway and the hills off Hwy 116 put serious wear on brake systems. If you’re hearing grinding, squealing, or your pedal feels soft, don’t put this one off. We replace brake pads, rotors, and calipers and bleed your brake lines right at your location.
Oil Change Service
We use synthetic motor oil and quality filters for every oil change. It takes about 30 minutes, and you don’t have to go anywhere. We check your fluids, air filter, and cabin filter at the same time at no extra charge.
Transmission Service
Slipping gears, rough shifting, or a delay when you pull out of a stop — these are signs your transmission needs attention. We service automatic and manual transmissions and can diagnose most issues on-site before recommending next steps.
Electrical System Repair
Fog and coastal moisture from the Pacific affect Sebastopol vehicles more than most people realize. Corroded battery terminals, failing sensors, and wiring issues are more common out here than in drier inland areas. We use oscilloscopes and digital inspection tools to trace electrical faults without unnecessary guesswork.
Smog Check & Repair
We’re California BAR-licensed and can help you get your vehicle ready for smog certification. If your car failed a smog check elsewhere, we’ll diagnose the emission issue and get it sorted.
Cooling System Repair
An overheating engine can turn into a blown head gasket fast. We inspect hoses, the radiator, thermostat, and water pump — and replace whatever’s failing before a small problem becomes a very expensive one.
Battery Replacement
Dead battery? We come to you, test your charging system, and install a new battery on the spot. Most battery replacements take under 30 minutes.
Suspension & Steering Repair
If your car pulls to one side, rides rough over Sebastopol’s rural roads, or your steering feels loose, your suspension or steering components may need attention. We handle shocks, struts, tie rods, and wheel alignment.
AC & Heating Repair
Summers in Sonoma County get warm. Winters get damp. Either way, you want your climate control working. We diagnose and repair AC systems, heater cores, and blower motors.
Additional Services
- Tire rotation and balancing
- Fuel system service
- Spark plug replacement
- Serpentine belt replacement
- Pre-purchase vehicle inspection
- Coolant flush and fluid services
- Preventive maintenance and tune-ups
- Fleet maintenance for local businesses
Why Sebastopol Drivers Choose On-Site Auto Repair
We Come to You — Really
This isn’t a gimmick. Our mobile repair van is fully equipped with professional tools, quality OEM and aftermarket parts, and everything a certified technician needs to do the job right outside a traditional shop. You don’t have to arrange a ride or take a day off work.
Honest Pricing, Written Before We Start
You’ll always get a written repair estimate before we begin. No surprise charges at pickup. No “we found a few more things” pressure. If we discover something beyond the original scope, we call you, explain it, and wait for your go-ahead.
ASE-Certified Technicians
Our techs hold ASE certifications in the areas they work in. That’s not a wall decoration — it means they’ve passed nationally recognized exams and have verified hands-on experience. You’re not getting someone who just says they’re a mechanic.
California BAR-Licensed
On-Site Auto Repair holds an Automotive Repair Dealer (ARD) registration through California’s Bureau of Automotive Repair. This is the state license required to legally diagnose and repair vehicles for compensation in California. Many shops skip this disclosure. We don’t.
Parts & Labor Warranty
Every repair we complete comes with a parts and labor warranty. We stand behind our work. If something isn’t right after we leave, we’ll come back and make it right.
Locally Owned and Part of This Community
We’re not a franchise. We live and work here in Sebastopol. We shop at the same places you do, drive the same roads, and care about the reputation we’ve built in this community. That matters to us more than any corporate rating.
Serving Sebastopol and All of West Sonoma County
Our service area covers the full West County corridor and beyond. We regularly work in:
- Sebastopol, CA (our home base)
- Graton, CA
- Forestville, CA
- Santa Rosa, CA
- Rohnert Park, CA
- Cotati, CA
- Petaluma, CA
- Windsor, CA
- Bodega Bay, CA
If you’re not sure whether we cover your area, just call. We’ll tell you straight.
Schedule Your On-Site Auto Repair in Sebastopol Today
You shouldn’t have to rearrange your whole day just to get your car fixed. On-Site Auto Repair makes it simple. Call us, tell us what’s going on, and we’ll set up a time that works for you.
We serve Sebastopol and all of Sonoma County with honest, professional auto repair — right where your car is.
Call us today or book your appointment online. We’ll come to you.
Frequently Asked Questions
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 CA drivers.
Do you really come to my location, or do I still have to drop my car off?
Yes, we really come to you. Our mobile mechanic service means we bring the tools, parts, and certified technician to your driveway, parking lot, or workplace. You don't have to drop anything off anywhere. Most repairs are completed on-site in one visit.
What kinds of repairs can you actually do on-site versus in a shop?
Honestly, more than most people expect. We handle oil changes, brake jobs, battery replacements, engine diagnostics, electrical repairs, cooling system work, AC and heating repairs, suspension work, fuel system services, and more — all on-site. The main exceptions are repairs that require a vehicle lift for extended periods, like full transmission rebuilds. If a job needs a shop, we'll tell you upfront instead of taking your money and sending you elsewhere.
Are your technicians actually certified, or do you just say that?
Our technicians hold current ASE certifications in their specialty areas. ASE (National Institute for Automotive Service Excellence) requires passing written exams and proving hands-on experience. Certification has to be renewed every five years. We can show you the credentials — just ask.
How much does mobile auto repair cost compared to a traditional shop?
Mobile repair is often comparable to traditional shop rates and sometimes less, because we don't carry the same overhead as a full brick-and-mortar facility. There's no shop fee for us to recover. You get a written estimate before we start, so you always know the cost before any work begins. No hidden fees, no inflated parts markups to make up the difference.
My car failed a California smog check. Can you fix that?
Yes. We're California BAR-licensed and experienced with smog-related repairs. A failed smog check usually comes down to emission system issues — catalytic converter problems, faulty O2 sensors, EVAP system leaks, or engine misfires. We'll diagnose the specific cause and repair it. We can also help you understand your options if your vehicle is borderline on emissions.
Do you work on hybrids and newer vehicles?
Yes. We work on domestic and foreign vehicles including hybrid models. Newer vehicles with complex electronics require up-to-date scan tools and trained technicians — which is exactly what we bring. If you have a specific make and model you're unsure about, call us and we'll confirm upfront.
What areas near Sebastopol do you serve?
We cover a wide stretch of Sonoma County including Graton, Forestville, Cotati, Rohnert Park, Petaluma, Santa Rosa, Windsor, and out toward Bodega Bay. If you're somewhere in West Sonoma County and not sure we reach you, give us a call and we'll find out together.
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