Welcome to On Site Auto Repair!
Auto Repair in Petaluma, CA
Auto repair in Petaluma, CA offering brake repair, oil changes, check-engine diagnostics, transmission service, tire replacement and alignments, AC repair, and scheduled maintenance for cars and light trucks.
Schedule your next auto repair appointment with our skilled technicians in Petaluma, CA today!
Our Auto Repair Services in Petaluma, CA
Brake Repair Petaluma, CA
Need Brake Repair in Petaluma, CA? Stop on Washington Street, Lakeville Highway with pad and rotor replacement, drum service, brake fluid exchange, caliper and wheel cylinder repair, and ABS diagnostics. We test-drive routes to confirm straight stops on foggy mornings and D Street hills. Get a free brake inspection, repairs, and parts matched to Toyota, Honda, Ford, Chevy, and Dodge. We fix squeals, vibration, pulling, soft pedals, and ABS lights from Old Adobe Road potholes. Choose a team that understands coastal moisture and dairy backroads. Learn more: Brake Repair in Petaluma, CA plus Brake Repair in Petaluma, CA now.
Radiator Repair Petaluma, CA
Radiator Repair in Petaluma, CA keeps you off the shoulder of Highway 101 and moving through Lakeville Highway traffic. If your temperature gauge climbs on the East Washington Street crawl or towing a boat to the Petaluma River, we diagnose coolant leaks, pressure-test the system, and verify water pump circulation. We replace radiators, thermostats, hoses, and belts, and perform coolant flushes that handle Sonoma County heat and coastal fog mornings. Our techs service Toyota, Honda, Ford, Chevy, Subaru, and more. Choose local Radiator Repair in Petaluma, CA to prevent head-gasket damage, avoid tow bills, and restore proper operating temperature.
Check Engine Light Repair Petaluma, CA
Check Engine Light Repair in Petaluma, CA pinpoints why your dash light is on—misfires on 101 climbs, EVAP leaks from loose gas caps after coast runs, or failing O2 sensors before Sonoma smog checks. We read live data, run smoke tests, test fuel trims, and verify readiness monitors so you pass emissions. Get clear, prioritized estimates and fixes that prevent tows on Lakeville Highway. Schedule Check Engine Light Repair in Petaluma, CA for rough idle, poor mileage, or a blinking light. Local knowledge of Toyota, Subaru, and hybrid systems speeds diagnostics. Choose Check Engine Light Repair in Petaluma, CA.
Auto AC Repair Petaluma, CA
Choose Auto AC Repair in Petaluma, CA when foggy mornings, Highway 101 traffic, and summer heat strain your climate control. Technicians diagnose weak airflow, musty odors from damp evaporators, leaking condensers from Lakeville Highway gravel, and failing blend doors on aging Subarus and Hondas. Services include R-134a or R-1234yf recharge, compressor and condenser repair, evaporator replacement, heater core and thermostat service, cabin filter replacement, and leak detection with UV dye and pressure testing. Prepare for coastal chill and wet winters with fast defrost and clear windows. Auto AC Repair in Petaluma, CA. Auto AC Repair in Petaluma, CA.
Oil Change Petaluma, CA
Get an Oil Change in Petaluma, CA that matches local driving. Stop‑and‑go on Washington Street, Highway 101 commutes, and farm‑road dust demand correct viscosity and high‑quality filters. We check fluids, replace filters, test batteries for foggy mornings, and reset maintenance lights per manufacturer specs to protect warranties. Expect quick service while you grab coffee downtown. Short trips to schools and SMART station idling create moisture; fresh oil prevents sludge, improves mileage, and avoids breakdowns on Lakeville Highway. Tow a boat to the river? We top off and inspect for towing heat. Book your Oil Change in Petaluma, CA today.
Suspension Repair Petaluma, CA
Choose Suspension Repair in Petaluma, CA to stop clunks, pulling, and uneven tire wear caused by potholes on Washington Street, Lakeville Highway, and rural Sonoma County roads. Technicians replace shocks and struts, ball joints, control arm bushings, and tie rods, then perform precise wheel alignment so your car tracks straight on Hwy 101 and handles wet winter curves on Adobe Road. Get power steering leak diagnosis, rack-and-pinion replacement, and complete suspension inspections for Ford, Toyota, Honda, Subaru, and more. This local focus addresses speed humps downtown and steep West Petaluma driveways. Learn more: Suspension Repair in Petaluma, CA today.
Tire Shop Petaluma, CA
Choose a Tire Shop in Petaluma, CA that solves local road problems. Potholes after winter rains on Lakeville Highway and Washington Street cause bubbles, pulls, and vibration; we diagnose, mount with proper torque, replace valve stems, patch punctures, and perform computer wheel balancing to stop shake at 55‑70 mph on Hwy 101. We service Toyota, Honda, Ford, Chevy, Subaru, and more, stock Michelin, Bridgestone, Goodyear, and Continental, and calibrate TPMS for foggy mornings. Get fast flat repair and same-day tire replacement before your commute to Santa Rosa or coastal trips. Visit Tire Shop in Petaluma, CA for precise results.
Transmission Repair Petaluma, CA
Need Transmission Repair in Petaluma, CA? Stop-and-go on Highway 101, Sonoma Mountain roads, and farm routes can overheat fluid, cause slipping, shudder, or delayed shifts. With Transmission Repair in Petaluma, CA, you avoid breakdowns on Lakeville Highway or Adobe Road. We test drive routes, scan live data, check fluid condition, and pinpoint leaks, solenoid faults, worn clutches, CV axles, or transfer case issues. Get same-day diagnostics, clear estimates, quality parts, and warranty-backed repairs for automatic, CVT, and manual gearboxes on Toyota, Honda, Subaru, Ford, Chevy, Dodge, and more. Choose Transmission Repair in Petaluma, CA to restore shifting across Petaluma.
About Our Auto Repair Shop in Petaluma, CA
On Site Auto Repair in Petaluma, CA provides mobile auto repair at your home or workplace. Services include diagnostics with OBD-II scanning, battery testing and replacement, starter and alternator replacement, brake pad and rotor service, fluid leaks and hose repairs, belt and tensioner replacement, radiator and cooling system service, oil changes, spark plugs and ignition coils, sensors (O2, MAF) replacement, check engine light troubleshooting, and pre-purchase inspections. Service areas include Petaluma neighborhoods and nearby routes like E Washington St, Lakeville Hwy, and McDowell Blvd.
About Petaluma, CA
Petaluma, CA blends Victorian-era architecture with roots in agriculture and river trade. Residents and businesses value its walkable downtown, craft manufacturing, and access to local farms. Notable landmarks include Petaluma City Hall, Petaluma Historical Library & Museum, Helen Putnam Regional Park, Petaluma Valley Hospital, and the Mystic Theatre, anchoring civic life, recreation, healthcare, and cultural events. Technicians travel to neighborhoods around Downtown, Eastside, and the Adobe Road corridor, servicing vehicles curbside or in driveway spaces. They understand Petaluma’s commute patterns on Highway 101 and local road wear, bringing diagnostics, battery service, brakes, fluid leaks, and scheduled maintenance to homes near Shollenberger Park, the Fairgrounds, and industrial sites along Lakeville Highway.
Petaluma's population is 59,776. City center coordinates: 38.2324, -122.6367. The city has a Mediterranean climate with cool, wet winters, dry summers, coastal fog, and occasional heat waves and wildfire smoke. On Site Auto Repair uses mobile diagnostics, battery and cooling-system checks, and brake service suited for temperature swings, and follows California BAR standards, CARB-compliant parts, and state hazardous-waste handling rules. Downtown: rapid diagnostics and brake service at curbside. West Petaluma: tune-ups and battery replacement at homes. East Petaluma: fluid leaks fixed in driveways. Oakhill-Brewster: suspension checks and oil changes on-site. McNear: starter and alternator repairs near residences. We use recycled materials and sustainable methods whenever possible, reducing waste while supporting Petaluma’s community events and local suppliers. Proud to serve neighbors across East Washington Street and Old Adobe Road. For reliable Auto Repair services in Petaluma, contact On Site Auto Repair today.
Cities We Serve
Things to Do
Petaluma Adobe State Historic Park
Shollenberger Park
Petaluma Historical Library & Museum
Helen Putnam Regional Park
Petaluma Wildlife Museum
Sonoma Portworks
The Petaluma Collective Militaria Mall
McNear Park
Walnut Park
Azari Vineyards
Keller Estate Winery
Parkwest Casino Sonoma
Lucchesi Park
Tolay Lake Regional Park
Arroyo Park
Transportation
Petaluma
Petaluma Blvd & Kent St
Petaluma Blvd N & Stony Point
Petaluma Blvd & Shasta Ln
Petaluma Transit
Copeland St
Petaluma Blvd S & G St
Petaluma Blvd S & Landing Way
Petaluma Blvd N At Shasta Ave/Sycamore
Petaluma Blvd N At Washington St NB
Petaluma Blvd & West St
Petaluma Blvd S At Mcnear Ave
McDowell Blvd & E Washington St
Petaluma Blvd S & Crystal Ln
Petaluma Blvd S & F St
Petaluma Blvd N At Oak St SB
Petaluma Blvd S At Mtn View Ave SB
Petaluma Blvd N At Gossage Ave Park
E Washington St at Vallejo St EB
4th & C Street
Driving Directions
Driving Directions from Northbay Automotive to On Site Auto Repair
Driving Directions from Petaluma Auto Repair to On Site Auto Repair
Driving Directions from Petaluma Auto Works to On Site Auto Repair
Driving Directions from Dave's Auto Repair to On Site Auto Repair
Driving Directions from Whole Auto Repair to On Site Auto Repair
Driving Directions from United Auto Repair & Tires to On Site Auto Repair
Driving Directions from Out West Garage to On Site Auto Repair
Driving Directions from Brodie's Tire & Automotive to On Site Auto Repair
Driving Directions from Empire Automotive to On Site Auto Repair
Driving Directions from Local Heroes Auto Service to On Site Auto Repair
Driving Directions from Sonoma Autowerks LLC to On Site Auto Repair
Driving Directions from Local Heroes Auto Repair to On Site Auto Repair
Driving Directions from Glenn's Auto & Truck Repair to On Site Auto Repair
Driving Directions from AAA Petaluma Auto & Tire Center to On Site Auto Repair
Driving Directions from Jay & Bill's Tire Service to On Site Auto Repair
Driving Directions from A&A Auto Repair to On Site Auto Repair
Driving Directions from Bill & Jays Auto Repair to On Site Auto Repair
Driving Directions from Petaluma Auto Craft to On Site Auto Repair
Driving Directions from Boulevard Automotive to On Site Auto Repair
Driving Directions from Yotaluma 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
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 Is My Coolant Light On in Sebastopol? What Low Coolant Actually Means for Your Engine
If your coolant warning light just came on near Sebastopol or anywhere in Sonoma County, don’t ignore it — low coolant can lead to serious engine damage fast. This guide explains what that light actually means, what causes coolant loss, and when you need to get it checked before a small problem becomes a very expensive one.
Why Are My Shocks and Struts Worn Out Already? What Healdsburg and Sonoma County Drivers Need to Know
If your ride feels bouncier than usual, or your car nose-dives when you brake, your shocks and struts might be telling you something. Here’s how to recognize the warning signs, why Sonoma County roads accelerate wear, and what to expect when you bring your vehicle in for suspension service.
How Do You Know When Your Car Battery Is Dying in Windsor or Santa Rosa? Signs, Tests, and What to Do
A dying car battery doesn’t always announce itself with a dramatic no-start. Learn the early warning signs Santa Rosa and Windsor drivers should watch for, what a proper battery test involves, and when it’s time to replace — before you’re stranded.
How Often Should You Change Your Transmission Fluid in Rohnert Park? Here’s What You Need to Know
Transmission fluid doesn’t get talked about as much as oil changes, but skipping it is one of the most expensive mistakes a driver can make. If you’re in Rohnert Park or anywhere in Sonoma County, here’s what you actually need to know about transmission fluid intervals, warning signs, and what happens when you wait too long.
Why Is My Car Shaking When I Drive? Steering and Suspension Warning Signs in Santa Rosa
If your car shakes, pulls to one side, or feels like it’s bouncing over every little bump, your steering or suspension is trying to tell you something. Here’s what those symptoms actually mean for Santa Rosa drivers — and when to get it looked at before a small problem becomes an expensive one.
Why Is My Car’s AC Blowing Warm Air in Petaluma? What’s Going On and How to Fix It
If your car’s AC is blowing warm air this summer, you’re not imagining it — and you’re definitely not alone in Petaluma or anywhere across Sonoma County. This article breaks down the most common reasons your AC stops cooling, what the warning signs mean, and when it’s time to bring it in for a proper diagnosis.
Why Is My Check Engine Light On in Santa Rosa? What It Actually Means and What to Do Next
That little amber light on your dashboard can mean anything from a loose gas cap to a failing catalytic converter — and most Santa Rosa drivers have no idea which one they’re dealing with. Here’s what the check engine light actually means, when it’s safe to keep driving, and when you need to pull over and call a shop right away.
Why Are My Brakes Squealing in Santa Rosa? What It Means and When to Get It Fixed
That high-pitched squeal when you hit the brakes is your car trying to tell you something — and in Santa Rosa, where hilly neighborhoods and long Highway 101 commutes put real strain on your braking system, it’s worth listening. This guide breaks down exactly what brake noise means, when it’s urgent, and what you can expect from an honest brake inspection.
Why Is My Car Overheating in Petaluma? What to Do and When to Get It Checked
If your temperature gauge is climbing or you’re seeing steam from under the hood around Petaluma or anywhere in Sonoma County, don’t ignore it. Overheating is one of the fastest ways to turn a minor repair into a major engine problem — here’s what’s actually happening, what to do in the moment, and when to bring it in.
Essential Hyundai maintenance tips for long-lasting performance
With regular maintenance, you can ensure that your Toyota performs at its best in the beautiful surroundings of Santa Rosa, CA. This guide offers imperative tips tailored to the unique driving conditions and climate in the area, helping you keep your vehicle in top...
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.