Welcome to On Site Auto Repair!
Auto Repair in Santa Rosa, CA
Auto repair in Santa Rosa, CA offering brake repair, oil changes, engine diagnostics, check-engine light troubleshooting, transmission service, smog checks, tire replacement and alignments, suspension and steering repairs, A/C service, and battery testing and replacement.
Visit our Santa Rosa location today for reliable and expert auto repair services!
Our Auto Repair Services in Santa Rosa, CA
Brake Repair Santa Rosa, CA
Need your brakes checked before commuting on Highway 101 or descending Mark West Springs Road? Choose Brake Repair in Santa Rosa, CA for squeal after fog, warped rotors from long descents, and stop-and-go wear on Guerneville Road. Technicians replace pads and shoes, resurface or replace rotors and drums, service brake fluid, repair calipers and wheel cylinders, and run ABS diagnostics. Get a free inspection and same-day repairs to navigate garages, Bennett Valley, and school lines safely. Book Brake Repair in Santa Rosa, CA. Stay ahead of grinding, pulling, vibration, and soft pedals with Brake Repair in Santa Rosa, CA.
Radiator Repair Santa Rosa, CA
Need Radiator Repair in Santa Rosa, CA before Highway 101 commute or hot Bennett Valley climbs? Our ASE-certified techs diagnose overheating: pressure-test for leaks, test coolant strength, verify water pump flow, inspect thermostats, fans, belts, and hoses, and flush contaminated coolant. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, and more. Local know-how matters—stop-and-go on Guerneville Road and summer heat around Sonoma County strain cooling systems. We handle emergency leaks and preventive maintenance to protect head gaskets and avoid tow bills. Book Radiator Repair in Santa Rosa, CA today. Choose pros for Radiator Repair in Santa Rosa, CA.
Check Engine Light Repair Santa Rosa, CA
Need fast Check Engine Light Repair in Santa Rosa, CA? We diagnose misfires, EVAP leaks, bad O2 sensors, and catalytic efficiency codes that keep you from passing Sonoma County smog. Our techs use OEM scan tools, smoke testing, and live data to pinpoint issues after Highway 101 commutes or cold mornings. Get clear results and readiness monitors set so you can complete your CA Smog Check. We service Toyota, Honda, Subaru, and more across Rincon Valley and Roseland. Book now: Check Engine Light Repair in Santa Rosa, CA — local Check Engine Light Repair in Santa Rosa, CA today.
Auto AC Repair Santa Rosa, CA
Auto AC Repair in Santa Rosa, CA solves weak airflow, hot cabins after parking at Coddingtown, smoky odors from wildfire season, and fogging on 101 mornings. Technicians diagnose with scan tools and pressure testing, then handle R-134a or R-1234yf recharges, leak detection, compressor and condenser repairs, or evaporator and blend door fixes. Expect reliable defrost for coastal fog and steady heat on chilly Bennett Valley commutes. Vineyard dust and road debris clogging condensers? We clean and restore performance. Heater core and thermostat service keep winter drives safe. Book Auto AC Repair in Santa Rosa, CA and get local care.
Oil Change Santa Rosa, CA
Need an Oil Change in Santa Rosa, CA? Get service that follows your manufacturer specs, keeps warranties valid, and targets local driving conditions. Stop-and-go on Mendocino Avenue, Highway 101 climbs, summer heat, and wildfire smoke break oil down faster; we replace oil and filters, check fluids and belts, and reset maintenance lights. We service Toyota, Honda, Subaru, Ford, Chevy, Lexus. Optimize fuel economy for Bennett Valley commutes and drives to the Russian River. Book an Oil Change in Santa Rosa, CA and avoid sludge, low oil pressure, and rough starts. Choose expertise for Oil Change in Santa Rosa, CA.
Suspension Repair Santa Rosa, CA
Dealing with clunks over Mendocino Avenue potholes or wandering on Highway 101? Choose Suspension Repair in Santa Rosa, CA to restore control, reduce tire wear, and smooth out vineyard and West County roads. We inspect shocks, struts, ball joints, control arms, bushings, tie rods, and steering racks, then align wheels for straight tracking and safer braking in winters. Fix leaks, eliminate uneven tread, and stop steering pull after curb hits downtown. We service Ford, Chevy, Toyota, Honda, Subaru, Lexus, Hyundai, and more. Book Suspension Repair in Santa Rosa, CA and get diagnostics and parts that match local driving demands.
Tire Shop Santa Rosa, CA
Choose a Tire Shop in Santa Rosa, CA that fixes local problems: pothole damage from winter rains, nails from rebuild projects, and uneven wear on Fountaingrove and Bennett Valley hills. Get precise mounting with torque specs, valve stem replacement, computer balancing to stop steering shake on Highway 101, puncture repair, and TPMS diagnostics when cool mornings trigger warnings. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, and more, and install Michelin, Bridgestone, Goodyear, and Continental. Expect fast flat repair and replacements before your commute to Montgomery Village or school drop‑off. Book at Tire Shop in Santa Rosa, CA.
Transmission Repair Santa Rosa, CA
Need Transmission Repair in Santa Rosa, CA? Stop slipping gears on Highway 101, shuddering starts on Fountaingrove hills, and burnt fluid after stop‑and‑go on Mendocino Avenue. Get precise diagnostics, a road test, and same-day answers. We service automatics, manuals, and AWD transfer cases for Subaru, Toyota, Honda, Ford, Chevy, Lexus, Hyundai, and more. Services include fluid exchange, filter replacement, clutch repair, CV axle service, seal leaks, solenoid replacement, and full rebuilds. Local technicians understand Sonoma County heat, fog, and grades that strain transmissions. Schedule a visit or request towing from Highway 12. Learn more: Transmission Repair in Santa Rosa, CA.
About Our Auto Repair Shop in Santa Rosa, CA
On Site Auto Repair in Santa Rosa, CA provides mobile automotive services at your home or workplace. Technicians handle diagnostics, check-engine light scans, battery testing and replacement, brake pad and rotor service, oil and filter changes, starter and alternator replacement, belt and hose replacements, cooling system repairs, and radiator and water pump service. We also perform spark plug and ignition coil replacement, suspension inspections, CV axle swaps, and fluid leaks checks. Service covers most makes and models in Santa Rosa and nearby neighborhoods.
About Santa Rosa, CA
Santa Rosa blends historic Railroad Square’s 19th‑century roots with a modern downtown centered on Courthouse Square. Residents and businesses benefit from walkable districts, regional healthcare at Santa Rosa Memorial Hospital, and access to outdoor space at Howarth Park and Spring Lake Park. Notable landmarks include the Sonoma County Administrative Building and the Charles M. Schulz Museum. Technicians travel to neighborhoods from Junior College to Bennett Valley, servicing vehicles curbside at homes, offices, and wineries along Highway 12. They handle check engine diagnostics, brakes, batteries, starters, and fluid leaks on-site, navigating downtown parking and hillside driveways. Service areas include near Courthouse Square, Montgomery Village, and around Howarth Park, with parts sourced from local suppliers for quicker turnarounds.
Santa Rosa's population is 178,127. City center coordinates: 38.4405, -122.7144. The city sees warm, dry summers, cool wet winters, coastal fog, and wildfire smoke periods. On Site Auto Repair adjusts services with high-temperature coolant checks, battery and charging diagnostics, air-filter and cabin-filter replacements for smoke, and brake inspections after wet seasons, while following California BAR repair regulations and emissions-related requirements. In Rincon Valley, we handle brake and battery issues on-site. Junior College area residents get quick diagnostics and tune-ups. Roseland drivers rely on mobile AC and suspension repairs. Bennett Valley sees oil changes and belts replaced. Montgomery Village gets alternator and starter service. We use recycled materials and sustainable methods to cut waste, and we support Santa Rosa’s community through local partnerships and donations that keep resources here in Sonoma County. For reliable Auto Repair services in Santa Rosa, contact On Site Auto Repair today.
Cities We Serve
Neighborhoods We Serve
Bellevue Ranch, Bennett Valley, Burbank Gardens, Coffey Park, Downtown Santa Rosa, Fountaingrove, Junior College, McDonald Avenue, Middle Rincon, Montecito Heights, Montgomery Village, Moorland, Northwest Santa Rosa, Oakmont Village, Proctor Terrace, Railroad Square, Ridgway Historic District, Rincon Valley, Roseland, Skyhawk, SOFA Arts District, South Park, South Park, West End, Wright Area Action Group,
Things to Do
Charles M. Schulz Museum and Research Center
Children's Museum of Sonoma County
Railroad Square Historic District
Howarth Park
Safari West
Trione-Annadel State Park
Luther Burbank Home & Gardens
Pacific Coast Air Museum
Spring Lake Park
Matanzas Creek Winery
Museum of Sonoma County
Juilliard Park
Balletto Vineyards
Hook & Ladder Vineyards & Winery
Snoopy's Home Ice
California Indian Museum & Cultural Center
Kendall-Jackson Wine Estate & Gardens
Santa Rosa Wednesday Night Market
Paradise Ridge Winery
Sugarloaf Ridge State Park
Transportation
Santa Rosa Transit Mall
Coddingtown
Santa Rosa CityBus - Fixed Route and Paratransit
Santa Rosa Ave & East Robles Ave
Greyhound
Santa Rosa Ave at Sebastopol Ave
Santa Rosa Ave & East Robles Ave
Santa Rosa Ave & Bellevue Ave
Santa Rosa City Bus
Piner Rd & Industrial Dr
Santa Rosa Ave at Colgan Ave
Third St & E St
Santa Rosa Junior College
Santa Rosa Ave at Burt St
Santa Rosa Ave & Commercial Ct (Market Place)
Third St at E St
Court St at Santa Rosa Ave
Santa Rosa Ave & Yolanda Ave
Santa Rosa Ave & Court Rd
Santa Rosa Ave & Court St
Driving Directions
Driving Directions from Hahn Automotive to On Site Auto Repair
Driving Directions from All Around Auto Repair to On Site Auto Repair
Driving Directions from Bonanno Automotive to On Site Auto Repair
Driving Directions from Santa Rosa Transmission & Car Care to On Site Auto Repair
Driving Directions from Wayne & Sons Automotive Repair, LLC to On Site Auto Repair
Driving Directions from GreenTech Automotive to On Site Auto Repair
Driving Directions from Fix Auto Santa Rosa to On Site Auto Repair
Driving Directions from Larsen Auto Care / 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
Driving Directions from Tristar Automotive to On Site Auto Repair
Driving Directions from Ultimate Auto Care to On Site Auto Repair
Driving Directions from AAA Santa Rosa Baker Auto & Tire Center to On Site Auto Repair
Driving Directions from Local Heroes Auto Care to On Site Auto Repair
Driving Directions from ABC Auto Repair to On Site Auto Repair
Driving Directions from Sartorial Auto Repairs to On Site Auto Repair
Driving Directions from Rincon Valley Auto Repair to On Site Auto Repair
Driving Directions from Bavarian Performance to On Site Auto Repair
Driving Directions from CK Auto Exclusive 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.