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 Car’s Cabin Air Filter Clogged in Sebastopol? What Wildfire Smoke and Dusty Roads Do to Your Interior Air Quality
If your car’s AC feels weak, smells musty, or your windows fog up faster than usual near Sebastopol or the West County, a clogged cabin air filter might be to blame. Here’s what wildfire smoke, dusty rural backroads, and Sonoma County’s seasonal conditions do to your cabin air filter — and when it’s time to replace it.
Why Are My Brakes Fading on the Hills Around Oakmont and Fountaingrove? What Brake Fade Actually Means for Sonoma County Drivers
If your brakes feel soft or less responsive after driving downhill in Oakmont, Fountaingrove, or Bennett Valley, you may be experiencing brake fade — and it’s more serious than most drivers realize. This guide explains what causes brake fade, why hilly Sonoma County terrain makes it more likely, and when to get your brakes inspected before a small issue becomes a dangerous one.
Why Is My Car’s Radiator Failing in Windsor? What Sonoma County Drivers Need to Know About Cooling System Repairs
A failing radiator can turn a normal drive through Windsor or anywhere in Sonoma County into a roadside emergency — especially during hot North Bay summers. Here’s how to spot the warning signs early, what a cooling system repair actually involves, and why catching it now can save you from a much bigger engine bill later.
Why Is My Car’s Power Steering So Stiff or Noisy in Petaluma? What’s Really Going On
If your steering wheel suddenly feels heavy, makes a whining noise, or jerks when you turn, something’s wrong with your power steering system. Here’s what Petaluma and Sonoma County drivers need to know about the warning signs, what causes them, and when to get it looked at before a small problem becomes a dangerous one.
Why Is My Car’s Timing Belt or Chain Failing in Healdsburg? What Sonoma County Drivers Need to Know
A failing timing belt or chain is one of the most serious — and most overlooked — problems a car can develop. If you’re driving through Healdsburg, Windsor, or anywhere in Sonoma County, here’s how to spot the warning signs before a small issue becomes a catastrophic engine failure.
Why Is My Transmission Slipping or Hesitating in Sonoma? What Automatic Transmission Problems Actually Feel Like
If your car is hesitating between gears, revving high without accelerating, or lurching unexpectedly on Sonoma Valley roads, your automatic transmission may be trying to tell you something important. Here’s how to recognize transmission trouble early — before a manageable repair turns into a costly replacement.
Why Is My Car Pulling to One Side on Highway 101 Near Cotati? What Uneven Tire Wear and Alignment Problems Actually Mean
If your car drifts or pulls to one side while driving Highway 101 near Cotati or anywhere in Sonoma County, it’s not something to brush off. Alignment issues and uneven tire wear often go hand-in-hand, and catching them early can save you hundreds in tire replacements and prevent a dangerous blowout. Here’s what’s really going on under your vehicle.
Why Is My Car Burning Oil So Fast in Healdsburg? What Excessive Oil Consumption Really Means
If you’re adding a quart of oil every few weeks in Healdsburg or anywhere in Sonoma County, something’s not right — and ignoring it can lead to serious engine damage. Here’s how to tell whether you have a real problem, what causes excessive oil consumption, and when it’s time to get your car looked at by a mechanic you can trust.
Why Is My Car Using More Gas Than Usual in Petaluma? What’s Behind Sudden Drops in Fuel Economy
If your car is suddenly getting fewer miles per gallon than it used to, something is wrong — and it’s rarely just the gas prices. Here’s what actually causes fuel economy to drop in Petaluma and across Sonoma County, and what you can do about it.
Why Is My Car Taking Forever to Warm Up in Rohnert Park? What a Slow-Warming Engine Actually Means
If your car is taking unusually long to reach normal operating temperature in Rohnert Park or anywhere in Sonoma County, it’s not just an inconvenience — it’s often a sign that your thermostat or cooling system needs attention. A slow-warming engine can hurt fuel economy, trigger the check engine light, and cause long-term engine wear. Here’s what’s actually going on and when to get it looked at.
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.