Check Engine Light Services

Mobile Check Engine Light Diagnostic in Marin County

Check Engine Light On? We’ll Come to You, Run a Full Diagnostic, and Tell You Exactly What’s Wrong

That little amber light on your dashboard could mean anything—from a loose gas cap to a serious engine issue. Instead of guessing or driving around worried, let Marin Mechanics bring answers to your driveway. Our mobile check engine light service includes a full diagnostic scan, expert interpretation, and a clear explanation of what’s going on—no upsells, no pressure, just the truth.

We serve all of Marin County, including San Rafael, Sausalito, Mill Valley, Larkspur, and Corte Madera.

Why Choose a Mobile Diagnostic with Marin Mechanics?

We Come to You: No need to drive with a warning light on—we scan it on-site.
Quick & Accurate: Professional-grade tools that go beyond basic OBD scanners.
Clear Answers: We explain the codes and what they mean—without the jargon.
Honest Recommendations: We’ll tell you what’s urgent and what can wait.
No Pressure: You decide if you want to fix it now or later—no shop tactics.

What’s Included in a Check Engine Light Diagnostic?

On-site OBD-II scan using professional equipment
Full review of fault codes and possible causes
Live data monitoring for misfires, fuel trims, sensors, and more
Clear explanation of findings (in plain English)
Repair recommendations and next steps
Optional on-the-spot service for minor issues (if applicable)

In many cases, we can fix the issue right away—especially if it’s related to your battery, ignition, tune-up, or cooling system.

Common Check Engine Light Causes We Diagnose

Faulty oxygen or mass airflow sensors
Misfires caused by bad spark plugs or coils
Loose or faulty gas caps
Cooling system problems (thermostat, coolant temp sensor)
Emissions or EVAP system leaks
Battery and charging system issues
Vacuum leaks or throttle body problems
Fuel delivery and injector faults

We’ll pinpoint the root cause, not just clear the code and hope for the best.

Areas We Serve

We proudly serve the entire Marin County area, including:

San Rafael
Sausalito
Mill Valley
Larkspur
Corte Madera
And surrounding neighborhoods

If you’re located nearby but not listed above, reach out—there’s a good chance we’ll still come to you.

How It Works

Book a Diagnostic Appointment
Let us know what light or symptoms you’re seeing and where your car is.
We Come to You
A certified mechanic arrives with the scanner and tools needed.
We Diagnose & Explain
You’ll receive a summary of what we found and what to do next. No guesswork. No pressure.