Diagnostic Services in Chattanooga, TN

Vehicle Diagnostic Services in Chattanooga, TN

Find the Problem Before You Replace the Parts

When your vehicle isn't running like it should, guessing can lead to unnecessary repairs and added expense. At May Bros Auto Repair, we use advanced diagnostic equipment and proven troubleshooting techniques to identify the source of engine, electrical, and performance problems before recommending a repair.


Whether your check engine light has come on, your vehicle is making an unusual noise, or something simply doesn't feel right, our experienced Chattanooga auto mechanics will perform a thorough diagnosis so you know exactly what's going on.

What Is a Vehicle Diagnostic Service?

A vehicle diagnostic service is the process of identifying the cause of a mechanical or electrical problem. Modern vehicles contain dozens of onboard computers and sensors that monitor engine performance, emissions, fuel delivery, electrical systems, and more.


Using professional diagnostic equipment along with hands-on testing, we evaluate your vehicle's systems to pinpoint the underlying issue—not just the symptoms.

Diagnostic Services We Provide

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Engine Diagnostics

Identify issues with performance, misfires, idle problems, and more.

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Computer Diagnostics

Scan and analyze your vehicle's computer systems for fault codes.

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Electrical Diagnostics

Troubleshoot batteries, charging systems, wiring, sensors, and more.

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Sensor Testing

Test sensors and components to ensure accurate performance.

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Warning Light Diagnostics

Identify the cause of dashboard warning lights and system alerts.

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Drivability Diagnostics

Diagnose shifting issues, starting problems, stalling, and rough running.

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Our Diagnostic Process

Every accurate repair starts with an accurate diagnosis.

We take a systematic approach to diagnosing vehicle issues so we can identify the root cause—not just the symptoms.

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1. Listen

Understanding the Problem

We start by listening to your concerns and learning about the symptoms you've experienced.

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2. Inspect

Checking the Basics

Our technicians perform a visual inspection and evaluate your vehicle for any obvious issues.

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3. Scan

Reading Vehicle Data

Professional diagnostic equipment is used to scan your vehicle's onboard computer systems for fault codes and performance data.

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4. Diagnose

Finding the Root Cause

We combine scan results with hands-on testing to accurately identify what's causing the problem.

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5. Recommend

Clear Next Steps

We'll explain our findings, answer your questions, and recommend the repairs your vehicle actually needs.

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Why Accurate Diagnostics Matter

Replacing parts without confirming the cause of a problem can become expensive quickly.


Professional diagnostics help:

  • Identify the actual source of the problem
  • Reduce unnecessary repairs
  • Save time and money
  • Improve vehicle reliability
  • Restore performance more efficiently


Finding the right problem first allows repairs to be completed more accurately and confidently.

Frequently Asked Questions

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What does a vehicle diagnostic check include?

A diagnostic service typically includes evaluating your vehicle's symptoms, scanning onboard computer systems when applicable, reviewing diagnostic trouble codes, testing related components, and identifying the cause of the issue.

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Does a check engine light always mean something serious?

Not always. A check engine light can be triggered by a variety of issues ranging from minor sensor faults to more significant engine or emissions problems. The only way to know for certain is through proper diagnostics.

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Can you diagnose electrical problems?

Yes. We diagnose a wide variety of electrical issues involving batteries, alternators, starters, sensors, vehicle computers, and related electrical systems.

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What vehicles do you diagnose?

We provide diagnostic services for most makes and models, including domestic, import, and many luxury vehicles.

Need Answers? Start With a Professional Diagnostic TEST

Vehicle problems rarely fix themselves, and waiting can sometimes lead to more expensive repairs. If your vehicle isn't performing like it should or a warning light has appeared, schedule a professional diagnostic service with May Bros Auto Repair.


Our experienced team will identify the problem, explain your options clearly, and help you get back on the road with confidence.