Check Engine Light Diagnosis

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Check Engine Light Diagnosis

Check Engine Light Diagnosis

When your check engine light comes on, it’s your vehicle’s way of telling you something’s wrong—but the exact cause isn’t always obvious. It could be something minor like a loose gas cap or something more serious like engine misfires or catalytic converter issues. At WrenchWorks Westfield, our certified technicians use advanced diagnostic tools to accurately identify the problem behind your check engine light. We’ll explain the issue clearly, recommend only the necessary repairs, and get you back on the road with confidence and clarity.

Service Features

What to Expect With Check Engine Light Diagnosis

1. Schedule Your Appointment

Book online or by phone and let us know when the check engine light appeared and if you noticed any other symptoms like rough idling or poor gas mileage.

2. Advanced Diagnostic Scan

Our technicians connect professional-grade diagnostic equipment to your vehicle’s onboard computer system to retrieve and analyze trouble codes and data.

3. Detailed Inspection Report & Estimate

You’ll receive a digital inspection report (DVI) via text or email, complete with diagnostic codes, photos, and transparent estimates for any necessary repairs.

4. Clear Explanation of Findings

Your service advisor will walk you through the diagnosis in plain language, outlining what the issue is, why it matters, and what your options are moving forward.

5. Accurate Repairs Completed

Once you approve the work, we’ll perform any required repairs using OEM-quality parts, ensuring the issue is resolved and your check engine light stays off.

6. Final System Reset & Road Test

After repairs, we clear all diagnostic codes, test your vehicle under real driving conditions, and re-scan the system to confirm everything is working properly.

Common Problems

Common Causes of a Check Engine Light

The check engine light can be triggered by a wide range of issues. Common causes include a faulty oxygen sensor, loose or damaged gas cap, worn spark plugs, mass airflow sensor issues, catalytic converter failure, or problems with the ignition or emissions systems. While some problems are minor, others can affect fuel efficiency and engine performance—so prompt diagnosis is always the smart move.

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FAQ

General Question

What causes the check engine light to turn on?

Common causes include faulty oxygen sensors, loose gas caps, catalytic converter issues, spark plug failures, or emissions system malfunctions. A diagnostic scan reveals the exact problem.

Can I keep driving with the check engine light on?

If the light is solid, it’s best to schedule diagnostics soon. If it’s flashing, you should stop driving immediately—this indicates a serious issue that can cause engine damage.

What is an OBD-II scan?

An OBD-II (On-Board Diagnostics) scan reads codes from your vehicle’s computer, helping our technicians identify problems in the engine, emissions, or transmission systems.

How long does it take to diagnose the issue?

Most diagnostics are completed in 30–60 minutes. We’ll explain the issue clearly and provide honest recommendations for repair—no pressure.

Is the diagnostic fee applied toward repairs?

Yes. If you choose to complete your repairs with us, your diagnostic fee is credited toward the total service cost.

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