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Auto Repair in Sebastopol, CA
Auto repair in Sebastopol, CA, including brake repair, oil changes, check engine light diagnostics, smog checks, tires and wheel alignments, suspension and steering repairs, cooling system service, battery and charging system testing, and A/C repair.
Get your car running smoothly again with expert auto repair services in Sebastopol, CA today!
Our Auto Repair Services in Sebastopol, CA
Brake Repair Sebastopol, CA
Need Brake Repair in Sebastopol, CA? Stop safely on Gravenstein Highway 116 and Bodega Highway with precise pad and shoe replacement, rotor or drum resurfacing, brake fluid exchange, caliper and wheel cylinder repair, and ABS diagnostics. We inspect brakes free, offer same-day turnarounds, and address wear from wet winters, coastal air rust, and hill descents toward the Laguna. Hear squeals, feel pulsation, or a soft pedal after West County traffic? Book Brake Repair in Sebastopol, CA. We use parts for Toyota, Honda, Ford, Chevy, Dodge, and more, and road-test routes to confirm results. Choose Brake Repair in Sebastopol, CA.
Radiator Repair Sebastopol, CA
Radiator Repair in Sebastopol, CA keeps commuters on Highway 116 and Bodega Avenue from overheating in orchard traffic and coastal runs. We diagnose coolant leaks, pressure-test radiators, verify water pump circulation, replace thermostats, hoses, and belts, and perform coolant flushes for Sonoma’s temperature swings and salty air. Get fast leak detection after gravel road trips west of town, and prevent boiling over in downtown stop-and-go by the plaza. Our technicians use advanced diagnostics to protect your engine. For emergencies or maintenance, choose local Radiator Repair in Sebastopol, CA you can reach quickly. Schedule Radiator Repair in Sebastopol, CA today.
Check Engine Light Repair Sebastopol, CA
Dealing with a dashboard warning in Sebastopol? Choose Check Engine Light Repair in Sebastopol, CA that pinpoints faults fast. We read live data, perform EVAP smoke tests for loose gas caps after farm-road dust, track misfires from damp morning starts, and find rodent-chewed wiring. Get clear estimates, prioritized fixes, and smog-test guidance for Sonoma County requirements. Avoid breakdowns on Bodega Ave, Hwy 12 and 116, or during school drop-offs at Analy. We service Toyota, Subaru, Honda, Ford, and hybrids. Stop by for same-day diagnostics or schedule mobile testing. Check Engine Light Repair in Sebastopol, CA helps you pass smog.
Auto AC Repair Sebastopol, CA
Dealing with airflow, fogged windows, or a hot cabin on Gravenstein Highway? Choose Auto AC Repair in Sebastopol, CA that targets West County realities—summer heat spikes, morning marine layer, dust, and wildfire smoke. Technicians perform R-134a/R-1234yf recharge, compressor and condenser repair, evaporator replacement, and UV leak detection. Heating fixes include heater core, thermostat, blend door, and climate control diagnosis, restoring quick defrost for redwood roads. We service Toyota, Honda, Subaru, Ford, Chevy, Lexus, Hyundai, and more using computer diagnostics and pressure testing. Schedule Auto AC Repair in Sebastopol, CA and keep commutes on Hwy 116 and Bodega Bay comfortable.
Oil Change Sebastopol, CA
Need Oil Change in Sebastopol, CA? Get service that fits local driving—stop‑and‑go on Main Street, weekend runs to Bodega Bay, dusty vineyard roads off Highway 116. Technicians use the right oil weight for cool coastal mornings and summer heat, replace filters, top fluids, and reset maintenance lights while keeping manufacturer specs and warranty requirements. Prevent sludge from short trips, improve mileage on Highway 12, and avoid breakdowns on backroads. Choose a scheduled interval that matches your commute or farm use. Book Oil Change in Sebastopol, CA. We inspect belts, batteries, and tires during every Oil Change in Sebastopol, CA.
Suspension Repair Sebastopol, CA
Dealing with clunks, pull, or uneven tire wear on Gravenstein Highway or Bodega Avenue? Choose Suspension Repair in Sebastopol, CA that addresses West County realities: winter potholes, farm roads, and drives toward Occidental. Technicians diagnose shocks, struts, ball joints, and tie rods, perform precision alignments, and service power steering to restore tracking and stable braking on Hwy 12 and wet Laguna corridors. Get estimates, quick turnaround, and parts matched to your Ford, Toyota, Subaru, or Lexus. Book Suspension Repair in Sebastopol, CA and stop bounce, vibration, and steering wander. Local Suspension Repair in Sebastopol, CA keeps tires lasting longer.
Tire Shop Sebastopol, CA
Need a Tire Shop in Sebastopol, CA? We install and balance tires to torque specs, fix punctures from vineyard wire and County gravel, replace valve stems, service TPMS, and match tires for Subarus and EVs common on Gravenstein Highway. Choose Michelin, Bridgestone, Goodyear, or all-terrain options for weekend runs to Bodega Bay. Stop vibrations with road-force balancing that smooths worn Sonoma backroads after winter storms. Walk in with a flat; get fast repair or complete replacement sized to your commute into Santa Rosa. Visit our Tire Shop in Sebastopol, CA to avoid uneven wear, improve braking, and drive home.
Transmission Repair Sebastopol, CA
Need Transmission Repair in Sebastopol, CA? We diagnose slipping, hard shifts, leaks, and clutch chatter caused by stop-and-go on Gravenstein Highway, hill starts toward Occidental, and runs to Bodega Bay. Get fluid exchanges, filter replacement, rebuilds, clutch service, CV axle repair, and transfer-case work for 2WD, AWD, and 4x4. We service Ford, Chevy, Toyota, Honda, Subaru, Acura, Lexus, Hyundai, using scanner-based and pressure-test diagnostics. Enjoy free transmission checks, same-day fluid service, and clear written estimates. Choose expertise that understands Sonoma County backroads and Highway 12 commutes. Start here: Transmission Repair in Sebastopol, CA for Transmission Repair in Sebastopol, CA.
About Our Auto Repair Shop in Sebastopol, CA
On Site Auto Repair provides mobile auto repair in Sebastopol, CA, serving homes, farms, and small businesses. Services include diagnostics with OBD-II scanning, brake pad and rotor replacement, battery testing and replacement, starter and alternator swaps, oil and filter changes, tune-ups, fluid leaks and hose repairs, belt and tensioner replacement, cooling system service, check engine light troubleshooting, and roadside no-start help. We work on most makes and light trucks, schedule by phone, and come equipped with parts and tools to complete repairs on-site.
About Sebastopol, CA
Sebastopol, CA grew from a plum-processing hub to a small city known for organic agriculture and creative arts. Residents and businesses value its walkable core, local markets, and strong environmental focus. Notable landmarks include the City of Sebastopol’s Civic Center, Ragle Ranch Regional Park, Ives Park, Laguna de Santa Rosa Wetland Preserve, and Sonoma Specialty Hospital. Technicians navigate West County roads to reach farms near Laguna de Santa Rosa, downtown businesses by the West County Museum, and homes off Bodega Avenue. Service trucks carry common Subaru, Toyota, and VW parts favored locally, plus mobile diagnostics for vineyard fleets. Appointments are timed around farmers’ markets and school traffic near Analy High, minimizing downtime for residents and merchants.
Sebastopol's population is 7,521. City center coordinates: 38.4020, -122.8239. The town has cool, wet winters and warm, dry summers, with coastal fog and seasonal rains affecting brakes, batteries, and electrical systems. On Site Auto Repair prioritizes corrosion checks, moisture-resistant diagnostics, and heat-rated fluids, and follows California regulations on parts recycling, hazardous waste handling, and CARB-compliant components. In Downtown Sebastopol, mobile techs handle quick diagnostics and brakes curbside. In South Sebastopol, they service commuters near Hwy 116. Near Ragle Ranch, they perform battery and starter replacements. In Laguna de Santa Rosa area, they address cooling issues. In Fircrest, routine maintenance. We use recycled materials and sustainable methods wherever possible, reducing waste while maintaining quality. We also support Sebastopol’s community through local sourcing and partnerships. For reliable Auto Repair services in Sebastopol, contact On Site Auto Repair today.
Cities We Serve
Neighborhoods We Serve
Things to Do
Ragle Ranch Park
Luther Burbank’s Gold Ridge Experiment Farm
The Barlow
Sebastopol
Patrick Amiot
Ives Park
Soft Medicine Sanctuary
Sebastopol Town Square
HopMonk Tavern Sebastopol
West County Museum
Laguna Wetlands Preserve
Transportation
Laguna Park Way & Sebastopol Transit Hub
Laguna Park Way & Sebastopol Transit Hub
Sebastopol Post Office
Ragle Park - Ragle Rd & Covert Ln
Sebastopol Rd at Doubles Dr
McKinley Street & Brown Street
Wilton Ave & Florence Ave
Santa Rosa Ave at Sebastopol Ave
Bodega Ave & Pleasant Hill Ave
Bodega Ave & Virginia Ave
Healdsburg Ave & N Main St (Safeway)
Pleasant Hill Ave & Valentine Ave
Hwy 116 & Southpoint Ave
Gravenstein Hwy & Hurlbut Ave
Gravenstein Hwy & Hurlbut Ave
Sebastopol Rd & Hampton Way
Gravenstein Hwy & Mill Station Rd
Gravenstein Hwy & Mills Station Rd
Mill Station Rd & Hwy 116
Hwy 116 & Bloomfield Rd
Driving Directions
Driving Directions from GOLDEN GEAR AUTOMOTIVE to On Site Auto Repair
Driving Directions from K-Tech Automotive to On Site Auto Repair
Driving Directions from Patterson Automotive to On Site Auto Repair
Driving Directions from Pete's Automotive to On Site Auto Repair
Driving Directions from Pauline's Automotive to On Site Auto Repair
Driving Directions from Big Brand Tire & Service to On Site Auto Repair
Driving Directions from J & W Foreign Auto Service to On Site Auto Repair
Driving Directions from The Neighbor's Kid Auto Repair to On Site Auto Repair
Driving Directions from G & C Auto Body, Inc. to On Site Auto Repair
Driving Directions from Caliber Collision to On Site Auto Repair
Driving Directions from Big O Tires to On Site Auto Repair
Driving Directions from Western Auto Body to On Site Auto Repair
Driving Directions from Randy Hanson Auto Body to On Site Auto Repair
Driving Directions from Kalemba's Tire Service to On Site Auto Repair
Driving Directions from Schank Brothers Garage to On Site Auto Repair
Driving Directions from Car Giveaway - K-Tech Automotive to On Site Auto Repair
Driving Directions from Miller Oil Company to On Site Auto Repair
Driving Directions from Saini Auto Sales to On Site Auto Repair
Driving Directions from North Bay Bavarian to On Site Auto Repair
Driving Directions from Coogler's Auto Repair to On Site Auto Repair
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 Santa Rosa drivers.
Do you provide loaner cars or shuttle service?
While we don't provide loaners, we're located in downtown Santa Rosa's Railroad Square with easy access to shopping, dining, and public transportation while you wait.
Can you work on my vehicle if it's still under warranty?
Absolutely! We perform warranty-compliant maintenance and repairs. We use OEM or equivalent parts to maintain your vehicle's warranty coverage.
How do I know if I really need the recommended service?
We provide detailed explanations and show you exactly what needs attention. We never pressure you into unnecessary repairs - our reputation depends on honest service.
Do you offer payment plans for major repairs?
We accept cash, check, and all major credit cards. For major repairs, we can discuss payment options that work for your budget.
What if my car breaks down outside of business hours?
Call our main number (707) 326-8655 and leave a message. We'll get back to you first thing in the morning to arrange service.
ReviewsWhat Our Clients Say
Brands We ServiceAuto Repair Brand
Toyota Repair
Honda Repair
Ford Repair
Chevrolet Repair
Nissan Repair
Mercedes Repair
Lexus Repair
Acura Repair
Infiniti Repair
Kia Repair
Hyundai Repair
Subaru Repair
Mazda Repair
Volkswagen Repair
Contact Info
Location
363 W 9th St B & C
Santa Rosa, CA 95401
Phone
707-326-8655
Hours
- Monday-Thursday: 7:30 AM - 4:30 PM
- Friday: 7:30 AM - 12:00 PM
- Saturday: Closed
- Sunday: Closed
New Customer Special:
$25 off your first service over $100. New customers only. One per household. Mention this offer when you call. Valid through December 31, 2026.
Oil Change Special:
Full synthetic oil change for $69.99. Includes up to 5 quarts of oil and a new oil filter. Most cars and light trucks. Valid through December 31, 2026.
Free Brake Inspection
Free brake inspection. We check pads, rotors, fluid, and lines and give you a written report. No purchase required.
Latest News
Why Are My Shocks and Struts Wearing Out So Fast in Sonoma County? What Drivers in Healdsburg and Surrounding Areas Need to Know
If your car feels bouncy, pulls on curves, or clunks over bumps on Sonoma County’s back roads, your shocks and struts may be telling you something important. Here’s what accelerates wear in this region, how to recognize the signs, and when it’s time to get them replaced.
Why Is My Car’s Brake Fluid Dark or Contaminated in Windsor? What Sonoma County Drivers Need to Know About Brake Fluid Service
Brake fluid doesn’t last forever — and in Sonoma County’s hilly terrain, contaminated fluid can quietly undermine your stopping power before you ever notice a problem. Here’s what dark or dirty brake fluid actually means, why it matters more than most drivers realize, and when to get it serviced in Windsor or anywhere across the North Bay.
Why Is My Car’s Clutch Slipping or Hard to Press in Santa Rosa? What Manual Transmission Drivers Need to Know
A slipping clutch or a pedal that suddenly feels stiff and heavy isn’t something to put off — it usually means your clutch system is wearing out or has a hydraulic problem. Here’s what manual transmission drivers in Santa Rosa and Sonoma County should watch for, and when it’s time to get it checked.
Why Is My Car’s Serpentine Belt Squealing or Cracking in Rohnert Park? What Sonoma County Drivers Need to Know
That squealing noise coming from under your hood in Rohnert Park isn’t something to ignore — it’s often your serpentine belt telling you it’s on borrowed time. Here’s what the belt actually does, how to spot the warning signs, and when to get it replaced before it leaves you stranded.
Why Is My Car’s AC Blowing Warm Air in Petaluma? What’s Really Going On with Your Cooling System
If your car’s AC is blowing warm air in Petaluma or anywhere in Sonoma County, it’s usually one of a handful of fixable problems — not an automatic reason to panic. This guide walks you through the most common causes, what to listen and look for, and when it’s time to bring your vehicle in for a proper diagnosis.
Why Is My Check Engine Light On in Healdsburg? What That Warning Light Is Actually Trying to Tell You
If your check engine light just came on somewhere between Healdsburg and Santa Rosa, don’t panic — but don’t ignore it either. That little amber light can mean anything from a loose gas cap to a misfiring engine, and knowing how to tell the difference can save you from a costly breakdown. Here’s what Sonoma County drivers actually need to know.
Why Is My Car’s Fuel Injector Clogged or Failing in Rohnert Park? What Sonoma County Drivers Need to Know
If your car is running rough, struggling to start, or suddenly getting worse gas mileage, dirty or failing fuel injectors might be the cause. Here’s what Rohnert Park and Sonoma County drivers need to know about fuel injector problems, what they actually feel like to drive, and when it’s time to bring your vehicle in.
Why Is My Car’s Alternator Failing in Sonoma? What Drivers in the Valley Need to Know About Charging System Problems
If your car’s lights are dimming, your battery keeps dying, or you’re hearing a whining noise under the hood, your alternator might be the real culprit. Drivers in Sonoma and throughout Sonoma Valley often confuse alternator problems with battery issues — here’s how to tell the difference and what to do about it.
Why Is My Car’s Differential Making Noise in Cloverdale? What Sonoma County Drivers Need to Know About Differential Service
A whining, grinding, or clunking noise from your differential is easy to ignore — until it becomes a very expensive repair. Here’s what Sonoma County drivers should know about differential service, warning signs, and when to get it checked before it gets worse.
Why Is My Car’s Battery Draining Overnight in Rohnert Park? What a Parasitic Draw Actually Means
If your car is dead every morning in Rohnert Park, the problem might not be the battery itself — it could be a parasitic draw quietly pulling power while your car sits. Here’s what that means, how it’s diagnosed, and when to get it checked by a local mechanic.
Read More About Our Auto Mechanic Services
On Site Auto Repair in Santa Rosa is a full service auto mechanic shop. Our auto mechanics are certified and are here to help with all of your repair needs. No auto repair job is too big or too small for On Site Auto Repair. We handle all types of auto repair, including regular maintenance, engine repair, brake work, and troubleshooting. If you are looking for honest and reliable auto mechanics, give us a call today. Ask us about our new customer specials.
Vehicles are usually described as 5 speed or 6 speed, meaning they have that many gear ratios. Those gears let the vehicle travel across the full range of speeds and use the engine's power efficiently. Transmissions are complex and are in constant use, so they take a lot of wear and tear. Many owners also forget to check and change the fluid on a regular schedule. That is why transmission problems are so common. At On Site Auto Repair in Santa Rosa, our transmission technicians can diagnose, repair, or replace your transmission. If you are looking for an honest transmission repair shop, give us a call today.
There are several warning signs that your vehicle can give you before your brakes may reach the point of potential failure or extensive repair. Whether composed of ceramic, semi-metallic, or organic materials, brake pads erode each time you depress the brake pedal. If the pads wear down too much without being replaced, the metal housing for the pads will make contact with the metal rotors (or drums), which may produce not only a safety issue but a situation where the rotors/drums are required to be replaced as a result of the prolonged contact of metal parts without the pad buffer. If you are in need of an affordable brake repair mechanic in Santa Rosa, please do not hesitate to schedule an appointment today!
Vehicle Inspection In Santa Rosa
The key to top notch automotive repair and troubleshooting lies in a thorough understanding of what’s actually going on under the hood. Sure, you know that a radiator keeps your engine cool, but understanding how it keeps it cool is the key to solving technical problems efficiently. If you know which parts perform what function, your powers of diagnosis will be much more powerful.
Radiator Inspection Service In Santa Rosa
Ensuring that your vehicle’s engine cooling system is in proper operating condition is extremely essential to engine life and performance. Operating at excessive temperatures can lead to premature engine wear. Your vehicle’s engine cooling system should be checked periodically, and a radiator coolant flush is also recommended to prohibit radiator corrosion. On Site Auto Repair will thoroughly drain and power flush the old coolant and particulates, and refill the cooling system with your vehicle manufacturer’s recommended coolant.
Our Santa Rosa Service Area – Directions to On Site Auto
Proudly serving drivers throughout Santa Rosa neighborhoods, from Railroad Square to Bennett Valley, and extending our trusted auto repair services to Petaluma, Sebastopol, Windsor, and all of Sonoma County.
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.
Things To Do In Santa Rosa, CA
From exploring the Charles M. Schulz Museum and Luther Burbank Home & Gardens to enjoying outdoor adventures at Spring Lake Regional Park and Annadel State Park, Santa Rosa offers endless opportunities for family fun, Wine Country experiences, and recreational activities that keep our community vibrant year-round.
Santa Rosa Transportation to On-Site Auto Repair
Conveniently located in the historic Railroad Square district with easy access from Highway 101, our auto repair shop is just minutes from downtown Santa Rosa, Santa Rosa Plaza, and all major neighborhoods, with nearby public transit options and walkable access to local shops and restaurants while your vehicle is being serviced.
Contact On-Site Auto Repair Today
Ready to experience honest, reliable auto repair in Santa Rosa?
Whether you’re dealing with a check engine light, need routine maintenance, or facing an unexpected breakdown, our ASE-certified mechanics are here to help. We serve drivers throughout Santa Rosa and Sonoma County with the same commitment to quality and honesty that has made us the area’s most trusted auto repair shop.