Welcome to On Site Auto Repair!
Auto Repair in Cotati, CA
Auto repair in Cotati, CA offering brake repair, oil changes, check-engine diagnostics, engine and transmission service, AC repair, alignments, suspension and steering work, tires and rotations, battery testing and replacement, and smog/maintenance inspections near Highway 101 and Old Redwood Highway.
Visit our Cotati, CA location today for all your auto repair needs.
Our Auto Repair Services in Cotati, CA
Brake Repair Cotati, CA
Need reliable stopping power for Highway 101 and Old Redwood Highway? Choose Brake Repair in Cotati, CA that fixes squeals, vibration, soft pedals, and ABS lights. Technicians replace pads and shoes, resurface or replace rotors and drums, service brake fluid, and repair calipers and wheel cylinders. We diagnose ABS issues for steep Cotati Grade descents and stop‑and‑go near La Plaza. Wet winters and coastal fog cause rotor rust; we prevent uneven wear and pulsation. Get a free brake inspection and same‑day appointments. Book Brake Repair in Cotati, CA to drive through Rohnert Park traffic, Penngrove hills, and SMART crossings.
Radiator Repair Cotati, CA
Need Radiator Repair in Cotati, CA? Overheating on Highway 101, the Cotati grade, or stop‑and‑go on Old Redwood Highway can ruin your commute to SSU or Santa Rosa. We diagnose coolant leaks, pressure‑test the system, verify water pump circulation, replace failed thermostats, radiators, hoses, and belts, and perform precise coolant flushes to prevent engine damage. Our advanced diagnostics pinpoint hot‑running issues fast, from clogged cores to failing fans. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, and more. Get local, same‑day solutions that keep your vehicle at proper temperature. Learn more: Radiator Repair in Cotati, CA. Right now.
Check Engine Light Repair Cotati, CA
Need Check Engine Light Repair in Cotati, CA? We diagnose EVAP leaks, misfires, and sensor faults with advanced scanners and smoke testing. Stay ready for Sonoma County smog checks by verifying monitors and fixing problems before your test. Short trips around Old Redwood Hwy and East Cotati Ave, rain, and vineyard dust often trigger codes; we pinpoint the cause and clear it correctly. Avoid a breakdown on US‑101; we test coils, O2 sensors, MAFs, and fuel trims, then provide clear next steps. Choose local Check Engine Light Repair in Cotati, CA. Schedule Check Engine Light Repair in Cotati, CA.
Auto AC Repair Cotati, CA
Searching for Auto AC Repair in Cotati, CA? Stay comfortable on 101 and Old Redwood Highway with EPA 609–certified service that fixes weak airflow, warm vents, mildew odors, and foggy-morning defroster issues. We recharge R-134a and R-1234yf, repair compressors and condensers, replace evaporators and heater cores, and perform blend door and thermostat service. Technicians use computer diagnostics, UV dye, and pressure testing to pinpoint leaks common after gravel and vineyard-road vibrations. Prepare for summer heat waves and damp coastal mornings with seasonal checks. Schedule Auto AC Repair in Cotati, CA and get reliable cabin comfort for daily Cotati driving.
Oil Change Cotati, CA
Need an Oil Change in Cotati, CA? Get the right viscosity for cool morning fog and summer heat on the 101/116 corridor. We use OEM‑spec filters, reset maintenance lights, check brakes, belts, coolant, and tire pressures, and recycle used oil. Short trips to schools and shops create moisture and fuel dilution; our service protects engines, improves MPG, and preserves warranty compliance. Diesel and hybrid options covered. Convenient access off Old Redwood Highway keeps commuters moving. Choose synthetic or high‑mileage blends, plus quick cabin/engine air filter swaps and battery testing. Schedule now: Oil Change in Cotati, CA done right here.
Suspension Repair Cotati, CA
Choose Suspension Repair in Cotati, CA that targets Sonoma County roads. Potholes from winter rains, the Cotati roundabouts, and Highway 101 on-ramps hammer shocks, struts, and bushings. We inspect clunks, pulling, tire cupping, and steering play; replace struts, shocks, ball joints, tie rods, and sway bar links; align wheels for even wear and straight tracking on Old Redwood Highway. Fix power-steering leaks and racks for easier parking near La Plaza Park. Technicians understand farm lanes toward Penngrove and wet braking on Stony Point Road. Book Suspension Repair in Cotati, CA. Restore control with Suspension Repair in Cotati, CA.
Tire Shop Cotati, CA
Need a Tire Shop in Cotati, CA? We handle puncture repair, tire mounting to proper torque, valve stem replacement, computer balancing, and TPMS service so you drive smoothly through Cotati’s roundabouts and Highway 101. Flats from nails on Old Redwood Hwy or pothole bubbles after winter rains? Stop in for diagnostics, road-force balancing, and tires from Michelin, Bridgestone, Goodyear, and Continental. We stock sizes for Subaru commuters, trucks on vineyard roads, and hybrids heading to Santa Rosa or Petaluma. Choose a Tire Shop in Cotati, CA that fixes vibration, pulls, and uneven wear. Your Tire Shop in Cotati, CA.
Transmission Repair Cotati, CA
Get reliable Transmission Repair in Cotati, CA that solves slipping, harsh shifts, and leaks caused by stop‑and‑go near Old Redwood Highway and US‑101. Technicians diagnose automatic, manual, CVT, and transfer cases; service fluid and filters; replace clutches, CV axles, and seals; and perform rebuilds when necessary. Accurate computer scans and road tests on Cotati backroads and Petaluma Hill Road pinpoint problems quickly, reducing downtime for commutes to Santa Rosa or campus runs to SSU. We service Subaru, Toyota, Honda, Ford, Chevy, Acura, Lexus, Hyundai, and more. Receive clear estimates and practical repair options. Book Transmission Repair in Cotati, CA
About Our Auto Repair Shop in Cotati, CA
Cotati drivers know that quality auto repair is just minutes away at On Site Auto Repair. Our Santa Rosa location has served the Cotati community since 2011, providing reliable car repair services to residents from La Plaza to East Cotati Avenue.
Our ASE-certified auto mechanics deliver the expertise Cotati vehicle owners expect. Whether you need brake repair, transmission repair, engine repair, or radiator repair, we use advanced diagnostics and quality parts to get the job done right the first time.
We've built our reputation as the best auto repair shop in the area through honest service and fair pricing. Our team excels at import car repair for Honda, Toyota, Subaru, Hyundai, and Acura vehicles, plus comprehensive domestic service including Ford repair, Chevy repair, and Dodge repair.
Cotati commuters dealing with check engine light issues or routine maintenance trust On Site Auto Repair for fast, dependable service. With over 25 years of experience and a 4.8-star rating, we're the auto mechanic Cotati relies on.
Call your Cotati area auto repair experts: (707) 326-8655
About Cotati, CA
Cotati, CA blends a historic hexagonal downtown street layout with a small-town pace rooted in early ranching and rail stops. Residents and businesses value the walkable core, community events, and local-serving commerce. Notable landmarks include La Plaza Park, Cotati City Hall, Cotati Police Department, Helen Putnam Community Center, and the Sonoma State University–adjacent Cotati Station transit hub. Technicians travel to Cotati neighborhoods and sites like La Plaza Park, Sonoma State’s nearby corridors, and business areas along Old Redwood Highway, handling mobile diagnostics, brake repairs, battery replacements, and roadside fixes on the spot. Appointments are scheduled around local traffic patterns and market hours, ensuring quick arrival, minimal disruption, and repairs suited to Cotati’s mix of residential streets and small commercial hubs.
Cotati's population is 7,592. City center coordinates: 38.3269, -122.7070. The area sees mild, wet winters and dry summers typical of Sonoma County, with coastal fog and occasional heat spikes. On Site Auto Repair adjusts service for temperature swings and road moisture, prioritizing battery checks, coolant and AC service, brake inspections, and tire pressure monitoring, while following California emissions, hazardous waste handling, and repair estimate regulations. In Cotati’s Downtown, mobile technicians handle quick diagnostics and repairs curbside. In La Plaza, we service commuter vehicles with brake and battery fixes. Near Cotati-Rohnert Park Expressway, we address check-engine lights. In Cotati Oaks, we perform tune-ups and fluid services. We prioritize eco-friendly practices, using recycled materials and sustainable methods whenever possible, and actively support Cotati’s community through local initiatives and partnerships. For reliable Auto Repair services in Cotati, contact On Site Auto Repair today.
Cities We Serve
Broken Clouds
Temperature
Wind Speed
Humidity
Neighborhoods We Serve
Things to Do
Scandia Family Fun Center
Cotati Historical Society
Karah Estate Vineyards
Rebounderz Rohnert Park - Indoor Trampoline and Adventure Park
La Plaza de Cotati
Cotati Veterans memorial building
Alicia Park
Reed Between The Lines
Sonoma Coast State Park
Stones Throw
Spancky's
Mercy Wellness Of Cotati
Libarle Vineyards
Flagship Taproom
Cotati
Grav South Brew Co.
Eight Ball
Jaded Toad BBQ & Grill Cotati
Cal Skate of Rohnert Park
Transportation
Cotati Hub
East Cotati Ave & La Salle Ave
East Cotati Ave & Santero Way
Old Redwood Hwy & Page St
East Cotati Ave & Camino Colegio Ave
Hwy 116 & Redwood Dr
East Cotati Ave & La Salle St
East Cotati Ave & Sunflower Dr
Old Redwood Hwy & St Joseph Way
E Cotati/Lancaster
East Cotati Ave & Lancaster Dr
East Cotati Ave & Cristobal Way
East Cotati Ave & Adrian Dr
Old Redwood Hwy & St Joseph Way
Old Redwood Hwy & George St
Raley's Town Center
East Cotati Ave & Camino Colegio Ave
Camino Colegio & East Cotati Ave
East Cotati Ave & Ryan Lane
East Cotati Ave & Snyder/Maurice
Driving Directions
Driving Directions from Performance Drivetrain to On Site Auto Repair
Driving Directions from AAA Cotati Auto & Tire Center to On Site Auto Repair
Driving Directions from Auto Phoenix to On Site Auto Repair
Driving Directions from Automotive Excellence to On Site Auto Repair
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Driving Directions from Joel's Harmony Garage to On Site Auto Repair
Driving Directions from German Motors to On Site Auto Repair
Driving Directions from Complete Automotive to On Site Auto Repair
Driving Directions from Acur-It Auto Repair to On Site Auto Repair
Driving Directions from Carl's Body Shop to On Site Auto Repair
Driving Directions from Big Johnsons Automotive to On Site Auto Repair
Driving Directions from My Mechanic to On Site Auto Repair
Driving Directions from A.C.E. Automotive to On Site Auto Repair
Driving Directions from Auto Repairs Unlimited to On Site Auto Repair
Driving Directions from Dan's Superior Auto Service to On Site Auto Repair
Driving Directions from Eddie's Paint Works to On Site Auto Repair
Driving Directions from Diesel Exhaust Services to On Site Auto Repair
Driving Directions from RPM Automotive Services to On Site Auto Repair
Driving Directions from Rohnert Park Transmission | Auto Repair to On Site Auto Repair
Driving Directions from Bowen's Automotive 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
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The Ultimate Guide to Honda Maintenance: Tips from Santa Rosa's Top Auto Mechanics
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5 Common Ford F-150 Issues and How On-Site Auto Repair in Santa Rosa Can Fix Them
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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.