Welcome to On Site Auto Repair!
Auto Repair in Sonoma, CA
In Sonoma, CA, we handle brake and rotor service, engine diagnostics and check-engine light troubleshooting, oil changes and tune-ups, transmission repair, AC service, suspension and steering work, wheel alignments, tire rotation and replacement, and battery testing and installation.
Book your Sonoma, CA auto repair appointment with us today - don't delay your vehicle’s health!
Our Auto Repair Services in Sonoma, CA
Brake Repair Sonoma, CA
Brake Repair in Sonoma, CA tackles steep Trinity Road grades and stop-and-go around Sonoma Plaza, preventing fade and pulling on Highway 12. Get pad and shoe replacement, rotor or drum resurfacing, brake fluid exchange, caliper and wheel cylinder repair, plus ABS diagnostics for wet winters and dusty vineyard lanes. Technicians service Toyota, Honda, Ford, Chevy, Dodge, hybrids, and EVs with attention to regenerative systems. Expect clear estimates, same-day turnarounds, and inspections that catch warped rotors, soft pedals, or squeals before weekend wine traffic. Schedule Brake Repair in Sonoma, CA for reliable stopping on Arnold Drive and school runs. Today.
Radiator Repair Sonoma, CA
Need Radiator Repair in Sonoma, CA? Stop overheating on Highway 12 or near Sonoma Plaza. Technicians diagnose coolant leaks, clogged cores, weak caps, failing thermostats, and worn hoses using pressure tests, dye tracing, and temperature monitoring. We service Toyota, Honda, Ford, Chevrolet, Subaru, Lexus, Hyundai, perform radiator replacement, coolant flushes, water pump and belt service, and verify fan operation for wine country hills and summer heat. We check circulation, purge air pockets, and set the correct coolant mix. Choose local Radiator Repair in Sonoma, CA to protect your engine. Schedule Radiator Repair in Sonoma, CA today before costly damage.
Check Engine Light Repair Sonoma, CA
Get Check Engine Light Repair in Sonoma, CA when that amber light pops on on Highway 12 or Arnold Drive. We diagnose EVAP leaks from loose gas caps, oxygen sensor faults, misfires, and catalytic converter efficiency issues using OEM-level scanners, smoke testing, and live data. Sonoma drivers get results, estimates, and repairs that set readiness monitors for smog checks. Vineyard dust, summer heat, and stop‑and‑go around Sonoma Plaza create issues we see often. Choose local expertise for Toyota, Subaru, and Honda. Learn more: Check Engine Light Repair in Sonoma, CA and schedule Check Engine Light Repair in Sonoma, CA.
Auto AC Repair Sonoma, CA
Choose local Auto AC Repair in Sonoma, CA when Highway 12 traffic and Valley of the Moon heat expose weak cooling. We diagnose with scan tools and pressure testing, recharge R‑134a or R‑1234yf, repair compressors, condensers, and evaporators, and find leaks fast. Prepare for summer winery runs and winter fog by restoring strong defrost, heater cores, thermostats, and blend doors. Dust from vineyard roads and wildfire smoke clog cabin filters—we replace them to improve airflow and air quality. We service Toyota, Honda, Subaru, Ford, Chevy, Lexus, Hyundai, and more. Book Auto AC Repair in Sonoma, CA today for comfort.
Oil Change Sonoma, CA
Need an Oil Change in Sonoma, CA? Short trips around the Plaza, vineyard dust on back roads, and summer heat thin oil and clog filters. We use manufacturer-approved oils and OEM filters, including synthetic and high-mileage blends for Toyota, Subaru, and more. Protect engines on Highway 12 grades, improve mpg on winding routes, and keep warranties compliant. Techs check leaks, belts, fluids, tire wear, reset lights. Dispose of used oil responsibly. Get service before a daily commute to Santa Rosa or Napa. Book an Oil Change in Sonoma, CA. Choose care for your next Oil Change in Sonoma, CA.
Suspension Repair Sonoma, CA
Need Suspension Repair in Sonoma, CA? Rough rides on Highway 12, potholes after rains, and washboard vineyard roads can wear out shocks, struts, bushings, and ball joints. We diagnose clunks, pulling, uneven tire wear, steering wander, and fluid leaks, then replace struts/shocks, control arms, tie rods, sway bar links, and perform wheel alignments. Expect steadier cornering on Trinity Road, smoother trips through Sonoma Plaza, and stopping distances. We service domestic and import cars and SUVs. Book Suspension Repair in Sonoma, CA to protect tires and restore handling. Choose a team that understands Arnold Drive speed humps and gravel approaches.
Tire Shop Sonoma, CA
Need a Tire Shop in Sonoma, CA that solves issues? We mount tires with correct torque, replace valve stems, perform computer and road-force balancing, repair punctures, and service TPMS—ideal for Highway 12 vibration, Arnold Drive washboard, and nails from construction. We stock Michelin, Bridgestone, Goodyear, and Continental for commuting, vineyard drives, and wet winter conditions. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, Acura, and more. Get same-day flat repair and replacements that keep you on schedule. Choose Tire Shop in Sonoma, CA. Your local Tire Shop in Sonoma, CA helps prevent uneven wear and steering pull safely.
Transmission Repair Sonoma, CA
Need Transmission Repair in Sonoma, CA that solves driving problems? We diagnose slipping on Highway 12 grades, harsh shifts in downtown stop‑and‑go, leaks after vineyard washboards, and Subaru AWD transfer case noise in winters. We service automatic and manual units, clutches, CV axles, and transfer cases on Toyota, Subaru, Honda, Ford, Chevy. We use scan tools, line‑pressure tests, and fluid analysis, then road‑test Arnold Drive to confirm fixes load. Expect estimates, OEM‑spec fluids, and quick turnaround so you can get back to the Plaza or Carneros. Schedule Transmission Repair in Sonoma, CA today for thorough Transmission Repair in Sonoma, CA.
About Our Auto Repair Shop in Sonoma, CA
Sonoma residents trust On Site Auto Repair for expert auto repair that's worth the short drive. Since 2011, we've served drivers from Sonoma Plaza to Boyes Hot Springs, El Verano to The Springs with honest diagnostics and quality car repair services.
Our family-owned shop features ASE-certified auto mechanics with over 25 years of combined experience. We specialize in brake repair, engine repair, transmission repair, and radiator repair—treating every Sonoma vehicle with the same care we'd give our own.
As the best auto repair shop serving Sonoma Valley, we're experts in import car repair for Toyota, Honda, Lexus, Acura, Subaru, and Hyundai vehicles. Wine Country drivers also rely on us for domestic service, including Ford repair, Chevy repair, and Dodge repair.
From routine maintenance to complex check engine light repair, On Site Auto Repair provides Sonoma customers with transparent pricing and dependable results. Discover why we've earned over 100 five-star reviews from satisfied customers.
Sonoma's trusted car repair shop: Call (707) 326-8655 today.
About Sonoma, CA
Sonoma, CA centers around its historic plaza and mission-era roots, with preserved adobe buildings and a walkable downtown. Residents and businesses benefit from a strong wine and food economy, accessible civic services, and scenic open space. Landmarks include Sonoma Plaza, Mission San Francisco Solano, Sonoma City Hall, Sonoma State Historic Park, and Sonoma Valley Hospital. Technicians travel to neighborhoods from Boyes Hot Springs to Agua Caliente, handling brake jobs, diagnostics, and battery replacements curbside. We service commuters near Highway 12, winery fleets along Arnold Drive, and residents around Sonoma Plaza. Mobile tools fit tight driveways and rural roads, minimizing downtime and towing. Appointments are scheduled around tasting room hours and local school pick-up times.
Sonoma's population is 10,739. City center coordinates: 38.2919, -122.4580. The area has warm, dry summers, cool wet winters, and occasional wildfire smoke and dust. On Site Auto Repair schedules mobile service around heat and rain, checks cooling systems and cabin air filters, and uses rust-preventive practices. Technicians follow California BAR regulations, proper waste handling, and state emissions-related procedures. Serving Boyes Hot Springs with mobile diagnostics and brake work, Temelec with scheduled maintenance, Agua Caliente with battery, starter, and alternator repairs, Fetters Hot Springs with cooling and hose fixes, and Sonoma Valley neighborhoods with roadside troubleshooting and quick part replacements. We use recycled materials and sustainable methods in every service, reducing waste while supporting Sonoma’s community through local suppliers and outreach. Our team is committed to Sonoma, CA standards and road conditions. For reliable Auto Repair services in Sonoma, contact On Site Auto Repair today.
Cities We Serve
Mist
Temperature
Wind Speed
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Neighborhoods We Serve
Things to Do
Sonoma Plaza
Sonoma State Historic Park
Sonoma TrainTown Railroad
Sonoma State Historic Park
Sonoma Valley Museum of Art
Sonoma Coast State Park
Sonoma Botanical Garden
Buena Vista Winery
Montini Open Space Preserve
Maxwell Farms Regional Park
Sonoma Garden Park
Sonoma Barracks
Sonoma Overlook Trail
Sonoma
Sonoma Family Fun Center
Vallejo Home
Sonoma County
Montini Open Space Preserve trailhead
Chateau Sonoma
Bartholomew Park
Transportation
Sonoma Plaza
Sonoma Valley Hospital
Sonoma Marketplace (on West Napa)
W MacArthur & Broadway (Ac Sonoma Vly HS)
2nd St W & Sonoma Marketplace
2nd St West & Sonoma Marketplace
Boyes Hot Springs (Sonoma Mission Inn)
Sonoma Valley Unified School District Bus Yard
Sonoma Valley Hospital
E Broadway & MacArthur (Ac Sonoma Vly HS)
Broadway & Maple St
2nd St W & Andrieux (Sonoma Medical Ctr)
Driving Directions
Driving Directions from Mike Larbre Automotive to On Site Auto Repair
Driving Directions from Metric Motors Auto Repair to On Site Auto Repair
Driving Directions from Broadway Auto Care to On Site Auto Repair
Driving Directions from El Verano Auto Repair to On Site Auto Repair
Driving Directions from Pacific Rim Auto Repair to On Site Auto Repair
Driving Directions from Sonoma Truck And Auto Service to On Site Auto Repair
Driving Directions from Eagle Automotive Sonoma, LLC to On Site Auto Repair
Driving Directions from Steve's Smog & Auto to On Site Auto Repair
Driving Directions from Lambert 76 to On Site Auto Repair
Driving Directions from Sonoma Mobile Auto & Tire Repair to On Site Auto Repair
Driving Directions from Auto Tech n' Tire to On Site Auto Repair
Driving Directions from G & C Auto Body, Inc. to On Site Auto Repair
Driving Directions from Wine country auto center & Tires sonoma to On Site Auto Repair
Driving Directions from Anton's European Car Service to On Site Auto Repair
Driving Directions from Oil Changers to On Site Auto Repair
Driving Directions from Auto Tech to On Site Auto Repair
Driving Directions from DeWitt's Tire & Brake to On Site Auto Repair
Driving Directions from Sonoma Motors Inc to On Site Auto Repair
Driving Directions from Tire repair mobile assistance to On Site Auto Repair
Driving Directions from Mike's Alignment & Brake 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
Hyundai Repair
Subaru Repair
Mazda Repair
Volkswagen Repair
BMW Repair
Mercedes Repair
Lexus Repair
Acura Repair
Infiniti Repair
Kia Repair
Contact Info
Location
363 W 9th St B & C
Santa Rosa, CA 95401
Phone
707-326-8655
Hours
- Monday-Friday: 8:00 AM - 5:30 PM
- Saturday: 8:00 AM - 4:00 PM
- Sunday: Closed
New Customer Special:
$25 Off First Service Over $100
Oil Change Special:
Full Synthetic Oil Change - $69.9
Free Brake Inspection
Complete brake system check at no charge
Latest News
Top Questions to Ask Your Auto Mechanic Before Starting a Repair
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How Our Santa Rosa Auto Mechanics Handle Emergency Repairs
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Common Auto Repairs and How Our Santa Rosa Mechanics Can Help
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The Most Common Auto Repair Issues and How to Prevent Them
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The Advantages of On-Site Auto Repair Over Traditional Shops
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The Role of Preventive Maintenance in Auto Repair
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Why On-Site Auto Repair is Santa Rosa's Top Choice for the best Auto Mechanics in Sonoma County
When your vehicle breaks down, you need a trusted partner to get you back on the road quickly and efficiently. As a car owner in Santa Rosa, you have a lot of options for auto mechanics, but only one stands out from the rest: On-Site Auto Repair. With their...
10 Signs Your Toyota Needs Professional Auto Repair in Santa Rosa
You rely on your Toyota to get you where you need to go, but when something goes wrong, it can be frustrating and even dangerous. Ignoring the warning signs can lead to more severe problems down the road, resulting in costly repairs or even an accident. By staying on...
The Ultimate Guide to Honda Maintenance: Tips from Santa Rosa's Top Auto Mechanics
As a Honda owner, you know that regular maintenance is key to extending the life of your vehicle. But with so many tasks to keep track of, it can be overwhelming. That's why our team of mechanics has put together this comprehensive guide to help you stay on top of...
5 Common Ford F-150 Issues and How On-Site Auto Repair in Santa Rosa Can Fix Them
As a Ford F-150 owner, you're not immune to the common issues that can leave you stranded on the side of the road. But don't worry, you've got options. If you're experiencing problems with your truck, our professional auto service team in Santa Rosa is here to help....
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 here to help you with all of your automotive repair needs. No auto repair job is too big or too small for On Site Auto Repair.We specialize in all types of auto repair, including: regular maintenance, break/fix, engine repair, troubleshooting and much more! 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 or 6 “speed” meaning then have that many gear ratios to allow the vehicle to travel at the full range of speeds required and to make use of the engine’s output power as efficiently as possible. Due to their complexity, constant use and function within a vehicle’s operation, transmissions experience a lot of wear and tear. Add to this the fact that many owner’s forget to check and change the fluid on a regular basis and it’s easy to understand why so many people have transmission problems. At On Site Auto Repair in Santa Rosa, our transmission repair technicians can accurately diagnose, repair or replace your transmission. If your are looking for a reliable and honest transmission repair services company, 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.
We Service Clients From All Over Sonoma County
From Wine Country commuters to local families, we provide reliable auto repair services to Santa Rosa, Petaluma, Sebastopol, Rohnert Park, Windsor, Healdsburg, and communities throughout 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.