Welcome to On Site Auto Repair!
Expert Mercedes Auto Repair in Santa Rosa, CA
Certified Service for All Mercedes-Benz Cars & SUVs
Whether you drive a C-Class, E-Class, GLC, or S-Class, On Site Auto Repair offers top-tier Mercedes-Benz service and repair in Santa Rosa and surrounding areas. Our ASE-certified technicians understand the precision engineering of Mercedes vehicles and use factory-grade diagnostics to identify and fix issues efficiently. From routine maintenance to complex repairs, your Mercedes is in expert hands.
Proudly serving Mercedes owners in Santa Rosa, Rohnert Park, Sebastopol, Petaluma, and all of Sonoma County since 2010.
Call (707) 326-8655 today for a free quote on your Mercedes service!
Serving Santa Rosa Since 2011
★★★★★ 4.9/5 (117 Google Reviews)
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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 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
Why Is My Car’s CV Axle or CV Joint Clicking in Petaluma? What That Popping Sound Means for Sonoma County Drivers
That clicking or popping sound when you turn your car in Petaluma isn’t something to ignore — it’s usually a worn CV joint, and catching it early can save you from a much bigger repair bill. Here’s what’s actually happening inside your drivetrain, what warning signs to watch for, and when to get it checked.
Why Does My Car Smell Like Something’s Burning in Petaluma? What Those Weird Odors Are Actually Telling You
A burning smell coming from your car is never something to ignore — and in Petaluma and throughout Sonoma County, drivers deal with specific conditions that can make these smells worse. Here’s how to figure out what that odor is actually coming from, and when you need to get it checked right away.
Why Is My Car’s Thermostat Failing in Rohnert Park? What Sonoma County Drivers Need to Know
A failing thermostat might seem like a small problem, but it can quietly lead to overheating, poor fuel economy, and expensive engine damage. If you’re driving in Rohnert Park or anywhere in Sonoma County, here’s how to recognize the warning signs early and what to do about it.
Why Is My Car’s Starter Motor Failing in Petaluma? What Sonoma County Drivers Need to Know About No-Start Problems
If you turn the key and hear a click, a groan, or nothing at all, your starter motor could be the culprit. Here’s how to tell what’s actually going on — and what Petaluma and Sonoma County drivers should do about it.
Why Is My Car’s Engine Misfiring in Petaluma? What Drivers in Sonoma County Need to Know
An engine misfire can feel like a stumble, shudder, or loss of power — and if you’re driving through Petaluma or anywhere in Sonoma County, ignoring it can lead to costly damage. Here’s what actually causes misfires, what the warning signs look like, and when it’s time to bring your car in.
Why Are My Tires Wearing Unevenly in Cotati? What Sonoma County Drivers Need to Know About Tire Wear Patterns
Uneven tire wear is more than a cosmetic issue — it’s usually a sign that something mechanical is off with your vehicle. If you’re driving in Cotati, Rohnert Park, or anywhere in Sonoma County and noticing bald edges, center wear, or cupping on your tires, here’s what’s actually causing it and what to do about it.
Why Is My Car’s Water Pump Failing in Sebastopol? What Sonoma County Drivers Need to Know
A failing water pump is one of the most overlooked causes of engine overheating in Sonoma County. If you’re driving in Sebastopol or anywhere around West County, here’s how to spot the warning signs before a small problem turns into a very expensive repair.
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.
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
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.
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Proudly Servicing Clients in 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.
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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.
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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.
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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.