Serving St. Charles County & surrounding areas  |  Call or text anytime: (636) 208-7938
St. Charles County's Mobile Mechanic

Mobile Auto Repair for St. Charles County. Skip the Shop.

Your home, your workplace, your schedule — we bring 15 years of hands-on auto experience directly to your door.

Oil Changes Brakes Diagnostics Batteries + More
15+
Years of Hands-On Experience
$89
Diagnostics Starting At
0
Waiting Rooms. Mystery Bills. Pressure.
Upfront Pricing
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No Shop Needed
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We Come to You
Same-Day Availability
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Fully Insured
Simple Process
How It Works

Getting your car fixed shouldn't be complicated. Here's what to expect.

01

Call, Text, or Request Online

Tell us your vehicle, your location, and what's going on. We'll give you an honest quote before anything starts.

02

We Come to Your Location

Our mechanic comes to your home or workplace — no tow, no waiting room, no disruption to your day.

03

Repair Done. You Move On.

We complete the repair on-site, walk you through what was done, and you're back on the road. That's it.

What We Fix
Services & Starting Prices

All prices are "starting at" — your quote is based on your vehicle's year, make, model, and job complexity. No surprises.

Diagnostics
Check Engine Light Diagnosticfrom $89
No-Start Diagnosticfrom $149
General Diagnostic / Inspectionfrom $89

★ Diagnostic fees are credited toward your repair when you approve the work same-day.

Maintenance
Oil Change — Conventionalfrom $79
Oil Change — Synthetic Blendfrom $99
Spark Plugs — 4-Cylinderfrom $249
Spark Plugs — V6from $349
Spark Plugs — V8from $449
Air Filter Replacementfrom $49
Cabin Air Filter Replacementfrom $49
Wiper Blade Replacementfrom $39
Battery Services
Battery & Charging System TestFREE with any service
Battery Test (stand-alone)$29
Standard Battery Replacement (installed)from $249
AGM Battery Replacement (installed)from $449

AGM batteries are required on many newer vehicles, European makes, and start-stop systems. We'll confirm which type your vehicle needs before quoting.

Brakes
Brake Fluid Flushfrom $129
Electrical & Starting
Alternator Replacementfrom $649
Starter Replacementfrom $549
Headlight / Taillight Bulb Replacementfrom $59
Cooling System
Coolant Drain & Refillfrom $149
Thermostat Replacementfrom $399
Water Pump Replacementfrom $699
Radiator Replacementfrom $899

Water pump and radiator jobs are quoted after vehicle verification — price varies significantly by make, model, and access.

Fleet & Business Vehicles Ask About Fleet Pricing
On-Site Maintenance (per vehicle)from $89 + parts
Fleet DiagnosticCustom quote

Custom pricing available for businesses with 3+ vehicles at a single location. We come to you and work through your fleet in one visit.

Not sure what you need? Call or text us and we'll help you figure it out — no commitment required. Diagnostic fees are credited toward your repair when you approve the work same-day. All prices are "starting at" and based on your vehicle's year, make, model, and job complexity. Repeat customer? Ask us about repeat customer discounts.
Where We Work
Service Area

Based in Lake Saint Louis, the highlighted area below is our core service zone — no trip fee. Outside the highlighted area? Call us anyway — we may still be able to help.

ClearWrench Mobile service area map covering Wentzville, O'Fallon, St. Peters, St. Charles, Lake Saint Louis, Cottleville, and Weldon Spring
Core zone covers Wentzville, O'Fallon, St. Peters, St. Charles, Lake Saint Louis, Dardenne Prairie, Cottleville, and Weldon Spring — no trip fee on most jobs. Outside this area, a $49 trip fee applies, waived on larger repairs.
Common Questions
FAQ

Straight answers to the questions we hear most.

How much does a mobile mechanic cost?
Usually about the same or less than a shop. We don't carry the overhead of a building, so our prices stay competitive, and you skip the tow and the time in a waiting room. Every price on this site is a "starting at" number, and you get a firm quote before any work begins.
Can you really do brakes in my driveway?
Yes. Brake pads, rotors, batteries, alternators, starters, oil changes, and most common repairs can all be done right where your car sits. We bring the tools, the parts, and the experience.
What areas do you serve?
We're based in Lake Saint Louis and serve all of St. Charles County, including Wentzville, O'Fallon, St. Peters, St. Charles, Cottleville, and Weldon Spring. Not sure if you're in range? Call or text and we'll tell you straight.
What if the repair can't be done on-site?
Some jobs need a lift or shop equipment. If we run into that, we'll tell you exactly what's going on, what it needs, and your best next step. You'll never pay for work we can't do.
How does the diagnostic credit work?
If you pay for a diagnostic and approve the repair the same day, that diagnostic fee comes off your total. You're paying for answers, not paying twice.
What is a pre-purchase inspection?
Before you buy a used car, we meet you at the seller's location and go through the vehicle top to bottom: engine, brakes, fluids, tires, signs of hidden damage. You get an honest report before money changes hands. It's the cheapest insurance you'll ever buy on a used car.
How do I schedule and pay?
Call, text, or use the request form on this page. We'll confirm a time window that works for you. We accept card, cash, and most major payment apps.
Get in Touch
Request Service or Get a Quote

Fill out the form and we'll get back to you fast — usually within the hour during business hours.

Prefer to call or text?

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Phone / Text(636) 208-7938
Call or text anytime — we respond fast
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Emailclearwrench@gmail.com
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HoursMonday – Saturday, 7am – 7pm
After-hours available (surcharge applies)
First time using a mobile mechanic? We'll walk you through everything before we start — no pressure, no mystery bills. You approve the work before we do it.

We typically respond within 1 hour during business hours. No commitment required.