Welcome to On Site Auto Repair!
Auto Repair in Rohnert Park, CA
Serving Rohnert Park, CA with brake repair, oil changes, engine diagnostics, transmission service, AC repair, tire rotation and wheel alignment, battery replacement, suspension and steering work, and smog checks.
Visit your local Rohnert Park auto repair specialist today for quality service you can trust!
Our Auto Repair Services in Rohnert Park, CA
Brake Repair Rohnert Park, CA
Brake Repair in Rohnert Park, CA keeps you safe on US‑101, Rohnert Park Expressway, and Cotati’s roundabouts. Stop-and-go traffic, commutes to SSU, and wet mornings wear pads, rotors, and ABS components. Get pad and shoe replacement, rotor/drum machining or replacement, caliper and wheel cylinder repair, brake fluid exchange, and ABS diagnostics. We inspect brakes free and offer same-day service, reducing downtime. Our technicians service Toyota, Honda, Ford, Chevy, Dodge, and imports with scan tools and testing on routes. Choose Brake Repair in Rohnert Park, CA to fix squeals, soft pedals, and pulling. Schedule Brake Repair in Rohnert Park, CA.
Radiator Repair Rohnert Park, CA
Need Radiator Repair in Rohnert Park, CA? Stop overheating on Highway 101 and Rohnert Park Expressway. We diagnose coolant leaks, clogged cores, failing water pumps, stuck thermostats, and collapsing hoses, then repair or replace parts fast. Technicians pressure-test, check circulation, verify fan operation, and flush contaminated coolant to prevent head gasket damage. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, and more. Get same-day help before a Sonoma State commute or a wine country drive. Schedule Radiator Repair in Rohnert Park, CA to keep temperatures steady. Choose local Radiator Repair in Rohnert Park, CA for turnaround and diagnostics.
Check Engine Light Repair Rohnert Park, CA
Need Check Engine Light Repair in Rohnert Park, CA? We scan codes, run EVAP smoke tests, and pinpoint misfires or sensor faults to prevent Sonoma County smog failures. Near Rohnert Park Expressway and US-101, we service Toyotas, Subarus, Hondas, and daily commuters to Santa Rosa or Petaluma. We verify readiness monitors, reseat loose gas caps after Costco fill-ups, and address catalytic converter efficiency codes. Get clear estimates and fixes that avoid roadside delays near Sonoma State or Golf Course Drive. Book Check Engine Light Repair in Rohnert Park, CA today: Check Engine Light Repair in Rohnert Park, CA now.
Auto AC Repair Rohnert Park, CA
Beat summer heat and winter fog with Auto AC Repair in Rohnert Park, CA that targets local driving. We diagnose with scans and pressure testing, then recharge R-134a or R-1234yf, repair compressors and condensers, replace evaporators, and track leaks appearing on Highway 101 commutes. Restore heat and clear windshields with heater core, thermostat, and blend door service—vital for coastal fog and rainy mornings near Sonoma State and SMART station. Expect reliable defrost for drives to Costco or Graton. Book Auto AC Repair in Rohnert Park, CA and get Auto AC Repair in Rohnert Park, CA that keeps cabins comfortable.
Oil Change Rohnert Park, CA
Get an Oil Change in Rohnert Park, CA that fits local driving. Stop-and-go on Rohnert Park Expy and Highway 101, short campus trips to Sonoma State, and heat thin oil and clog filters. We replace oil and filters to spec for Toyota, Honda, Subaru, Ford, verify weights for Sonoma temperatures, reset maintenance lights, inspect leaks, belts, and batteries, and top coolant, brake, and washer fluids. Choose synthetic for frequent Santa Rosa commutes; we document service to protect warranties. Schedule Oil Change in Rohnert Park, CA today—your next Oil Change in Rohnert Park, CA prevents engine wear and improves mileage.
Suspension Repair Rohnert Park, CA
Need Suspension Repair in Rohnert Park, CA? Potholes along Rohnert Park Expy, speed humps near Sonoma State, and Hwy 101 commutes can bend control arms, wear shocks, and cause pulling or tire cupping. We diagnose clunks, vibrations, and uneven tire wear, then replace struts, shocks, ball joints, and tie rods, perform power steering repairs, and finish with a precise alignment suited to local roads. Expect safer stops, steadier lane changes, and quieter rides through Cotati. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, and more. Book Suspension Repair in Rohnert Park, CA for fast testing, estimates, and results.
Tire Shop Rohnert Park, CA
Need tires that handle Rohnert Park Expressway, 101, and rainy Sonoma winters? Our Tire Shop in Rohnert Park, CA installs and balances tires, torquing lugs to spec, replacing valve stems, programming TPMS, and fixing punctures fast so you avoid vibration and uneven wear. Choose Michelin, Bridgestone, Goodyear, or Continental sized for your Toyota, Honda, Subaru, truck. Drop in before a Cotati commute or Sonoma State run; we diagnose sidewall damage from potholes and curbing, then mount safely. Use same-day flat repair or complete replacement. Book at Tire Shop in Rohnert Park, CA—your local Tire Shop in Rohnert Park, CA.
Transmission Repair Rohnert Park, CA
Need Transmission Repair in Rohnert Park, CA? We diagnose slipping, hard shifts, leaks, and clutch chatter from Highway 101 commutes, stop-and-go on Rohnert Park Expressway, and Sonoma State traffic. Get fluid exchange, filter replacement, clutch replacement, CV axle repair, transfer case service, and rebuilds for Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai. Free transmission diagnostics pinpoint issues with scanners and pressure tests, reducing guesswork. We road-test around Commerce Blvd and Petaluma Hill Road to verify smooth shifting. Book Transmission Repair in Rohnert Park, CA to restore drivability. Schedule Transmission Repair in Rohnert Park, CA before minor symptoms become costly.
Reliable Auto Repair Services in Rohnert Park, CA
On Site Auto Repair provides mobile auto repair in Rohnert Park, CA, coming to homes, offices, and roadside locations. Services include battery testing and replacement, starter and alternator repair, brake pad and rotor replacement, check engine light diagnostics, oil and filter changes, serpentine belt replacement, radiator and cooling system service, hose and clamp repairs, and fuel system troubleshooting. Technicians handle no-start issues, fluid leaks, and scheduled maintenance. Service covers Rohnert Park neighborhoods and nearby areas, minimizing towing needs and getting vehicles back on the road locally.
About Rohnert Park, CA
Rohnert Park blends planned neighborhoods with open greenbelts and a history rooted in former ranchlands transformed into a master-planned city. Residents and businesses benefit from walkable districts, local employment centers, and community amenities. Notable landmarks include City Hall, Rohnert Park Community Center, Spreckels Performing Arts Center, Roberts Lake Park, and Graton Resort & Casino. Technicians come directly to neighborhoods near Sonoma State University, business parks along Commerce Boulevard, and homes by Cotati-Rohnert Park SMART station, handling diagnostics, brakes, batteries, and starters on-site. They account for campus parking rules and HOA restrictions, schedule around commuter hours, and source parts from local suppliers to minimize downtime and keep Rohnert Park drivers moving without shop visits.
Rohnert Park's population is 44,390. City center coordinates: 38.3396, -122.7011. The city has a mild Mediterranean climate with cool, wet winters and warm, dry summers that can reach triple digits during heat waves. On Site Auto Repair tailors services with cooling system checks, battery testing, and fluid inspections for temperature swings, using CARB-compliant parts and EPA/CA hazardous waste handling. Neighborhoods we serve: Cotati-Rohnert Park—mobile diagnostics and quick brake jobs near Snyder Lane; F Section—battery replacement and oil changes on-site; G Section—check-engine troubleshooting curbside; H Section—belt and hose repairs; University District—pre-trip inspections for student commuters. We prioritize eco-friendly practices, using recycled materials and sustainable methods, and we actively support Rohnert Park’s community through local initiatives and partnerships that keep services accessible across Rohnert Park, CA. For reliable Auto Repair services in Rohnert Park, contact On Site Auto Repair today.
Cities We Serve
Neighborhoods We Serve
Things to Do
Scandia Family Fun Center
Rebounderz Rohnert Park - Indoor Trampoline and Adventure Park
Crane Creek Regional Park
Reed Between The Lines
Ladybug Park
Rainbow Park
Caterpillar Park
Rohnert Park
Graton Resort and Casino
Transportation
Commerce Blvd./ RP Expwy.
Rohnert Park Bus Pad
Rohnert Park SMART Station
Rohnert Park Expy Bus Pad
Commerce Blvd & RP Expressway
Rohnert Park Expy & Hwy 101
Old Redwood Hwy & Page St
East Cotati Ave & Santero Way
Snyder Ln & Keiser
Raley's Town Center
Rohnert Park Station
Rohnert Park Library
Old Redwood Hwy & St Joseph Way
RP Expressway & LaBath
Redwood Dr & Commerce Blvd
Snyder Ln & RP Express Way
Rohnert Park Expressway & Snyder Lane
Cotati Hub
East Cotati Ave & Snyder/Roman
Country Club Dr & Ellen St
Driving Directions
Driving Directions from Automotive Excellence to On Site Auto Repair
Driving Directions from Rohnert Park Transmission | Auto Repair to On Site Auto Repair
Driving Directions from Acur-It Auto Repair to On Site Auto Repair
Driving Directions from Complete Automotive to On Site Auto Repair
Driving Directions from Auto Repairs Unlimited 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 Dan's Superior Auto Service to On Site Auto Repair
Driving Directions from RPM Automotive Services to On Site Auto Repair
Driving Directions from Bowen's Automotive to On Site Auto Repair
Driving Directions from KP Motorworks to On Site Auto Repair
Driving Directions from AAA Cotati Auto & Tire Center to On Site Auto Repair
Driving Directions from Precision MotorWerks, German Car Repair to On Site Auto Repair
Driving Directions from Big Johnsons Automotive to On Site Auto Repair
Driving Directions from Crash Champions LUXE | EV Certified Repair Rohnert Park West to On Site Auto Repair
Driving Directions from Bevan Auto Repair to On Site Auto Repair
Driving Directions from Rohnert Park Tire Hub to On Site Auto Repair
Driving Directions from Auto Phoenix to On Site Auto Repair
Driving Directions from Advance Smog Auto Care Center to On Site Auto Repair
Driving Directions from Mobil 1 Lube Express 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.