Welcome to On Site Auto Repair!
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- Real Results: View photos of our team in action.
- Quality Work: See the repairs that earned us 5-star reviews.
- Customer Trust: Trusted across Santa Rosa and Sonoma County.
Serving Santa Rosa Since 2011
★★★★★ 4.9/5 (117 Google Reviews)
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 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.
Why Is My Subaru Using So Much Oil Between Changes in Sonoma County? What Subaru Owners Need to Know
If your Subaru is burning through oil faster than it should, you’re not alone — and it’s not something to ignore. Excessive oil consumption is one of the most common complaints from Subaru owners in Sonoma County, and understanding what’s behind it can save your engine. Here’s what’s actually going on and what to do about it.
Why Is My Car’s Heater Not Working in Sebastopol? What to Check Before Winter Gets Worse
If your car’s heater is blowing cold air or barely warming up during Sonoma County’s wet winters, it’s more than just a comfort issue — it can affect your defroster, visibility, and engine health. Here’s what’s likely going on and when to bring it in for a proper diagnosis.
How Do You Know If Your Car Needs a Wheel Alignment in Windsor or Santa Rosa?
If your car is pulling to one side, your steering wheel feels off-center, or your tires are wearing unevenly, you probably need a wheel alignment. Here’s how to recognize the signs, why Sonoma County roads are especially hard on alignment, and when to get it checked.
Why Is My Car Hesitating When I Accelerate in Santa Rosa? What’s Causing That Sluggish Response
If your car hesitates, stumbles, or feels sluggish when you press the gas pedal in Santa Rosa or anywhere in Sonoma County, something is off — and it’s usually more than just a minor annoyance. This article explains the most common causes of acceleration hesitation, what warning signs to watch for, and when it’s time to bring your vehicle in before a small problem turns into a costly repair.
Why Is My Car Making a Grinding Noise When I Turn in Petaluma? What’s Going On with Your CV Axles and Wheel Bearings
A grinding or clicking noise when you turn your steering wheel is one of those symptoms you shouldn’t ignore — it usually means your CV axles or wheel bearings are telling you something important. If you’re driving around Petaluma or anywhere in Sonoma County and noticing this sound, here’s what it actually means and when to get it checked.
Why Does My Car Smell Burning When I Drive in Sonoma County? What Different Smells Actually Mean
A burning smell coming from your car is never something to ignore — and different smells point to very different problems. Here’s how to identify what you’re smelling and what to do about it before a minor issue turns into a major repair.
Why Is My Car Leaking Fluid in Petaluma? How to Identify What’s Dripping Under Your Vehicle
A puddle under your car isn’t always serious — but it’s never something to ignore. This guide helps Petaluma and Sonoma County drivers identify common fluid leaks by color, location, and smell, and explains when it’s safe to drive and when you need to pull over immediately.
Why Is My Oil Looking Dark and Gritty in Rohnert Park? What Your Engine Oil Is Actually Telling You
Dark, gritty, or milky engine oil is your car’s way of sending you a warning signal — and ignoring it can turn a simple oil change into a costly engine repair. If you’re a driver in Rohnert Park or anywhere in Sonoma County, here’s what your oil is actually telling you and when to act.
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.
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.