Why is My Check Engine Light On? | The Oak Tree

August 1, 2024

Why is My Check Engine Light On? | The Oak Tree

It's a common question: "Why is my check engine light on?" At Wayside Garage, we see this issue frequently. Your car's check engine light can illuminate for various reasons, and understanding why is crucial to maintaining your vehicle's health.

Understanding Your Vehicle's Diagnostics

Modern cars are complex, equipped with 30 to 50 computer modules. When we perform diagnostics, we're plugging into your car's onboard diagnostic port and scanning these computers for error codes. Think of your car’s diagnostic system as an oak tree:

- Diagnostic Port: The trunk, where we connect our equipment.
- Computer Modules: The branches stemming from the trunk.
- Subcomponents: The smaller branches and leaves.

When the check engine light comes on, we identify the main "branch" causing the issue and then inspect the smaller branches and leaves to pinpoint the exact problem. This process involves multiple steps, ensuring we accurately diagnose and fix the issue.

Common Causes of a Check Engine Light

1. Loose Gas Cap: Surprisingly, something as simple as a loose gas cap can trigger the check engine light. Ensure your gas cap is tightly secured after refueling.
2. Faulty Sensors: Oxygen sensors, mass airflow sensors, and others can fail, causing the light to turn on.
3. Catalytic Converter Issues: Problems with this essential emission control device can also illuminate the light.
4. Spark Plugs and Wires: Worn or faulty spark plugs and wires can cause misfires, leading to a check engine light.
5. Electrical Issues: Intricate electrical problems may also be the culprit.

What to Do When Your Check Engine Light Comes On

1. Don't Panic: While it’s important, a check engine light doesn't always indicate a severe problem.
2. Check the Gas Cap: Ensure it’s secure. This simple step can often resolve the issue.
3. Get a Professional Diagnosis: If the light remains on, bring your vehicle to Wayside Garage. Our ASE-certified technicians will perform a thorough diagnostic check to identify and fix the problem.

Regular Maintenance is Key

To avoid unexpected check engine lights, adhere to a regular maintenance schedule. At Wayside Garage, we recommend:

- Oil & Filter Service: Every 5,000 miles or six months.
- Comprehensive Inspection: Annually or every 10,000 miles.
- Fuel & Air System Tune-Up: Every 12,000 miles or annually.

For electric vehicles, our **Annual Electric Vehicle Maintenance Service** ensures optimal performance and longevity.

Trust Wayside Garage

Our team at Wayside Garage is dedicated to keeping your vehicle in top shape. If your check engine light is on, don’t hesitate to contact us. Call us at 831-899-2425 or schedule an appointment online at www.waysidegarage.com.

Stay safe on the road, and for more tips, subscribe to our YouTube channel.

< Older Post

Newer Post >

Where Can I Get Brake Repair Near Seaside or Monterey?

By Stacey Diaz • October 28, 2025

Need brake repair near Seaside or Monterey? Free pads and 10% donated to breast cancer research through Oct. 31st at Wayside Garage. Book now.

Everything You Need to Know About Transmission Service and Repair at Wayside Garage

By Wayside Garage • October 25, 2025

Enhance your car's performance with Wayside Garage's advanced transmission service in Seaside, CA. Trust our experts for quality care. Visit us today!

Brake inspection, Car safety, Brake maintenance, Brake pad replacement, Wayside Garage

WHEN SHOULD I GET MY BRAKES INSPECTED?

By Stacey Diaz • October 14, 2025

Not sure when to check your brakes? Learn the signs and timing for brake inspections — and why October is a smart time to visit Wayside Garage in Seaside, CA.

ARE MY BRAKES SAFE?

By Stacey Diaz • October 14, 2025

October is more than just pumpkin patches and crisp fall air. For many families in Monterey, it's also the start of darker evenings, wetter roads, and more time on the road. That’s why October is the perfect time to think about one of the most important safety features on your vehicle: your brakes. At Wayside Garage, we participate in the Brakes for Breasts campaign every October. It's not just about brake repair — it’s about raising awareness, supporting breast cancer research, and keeping our community safe on the roads. ________________________________________ What Are the Signs Your Brakes Might Need Attention? Your brakes are your first line of defense in an emergency. If you’re noticing any of these symptoms, it’s time to get your brakes checked: • Squealing or grinding noises • A soft or “spongy” brake pedal • Car pulling to one side when braking • Vibration or shaking when you press the brakes • Increased stopping distance Ignoring these signs can lead to expensive repairs down the road — or worse, a serious accident. We always say: if it feels off, bring it in. ________________________________________ Why Brake Inspections Matter More in Fall With more rain, shorter days, and holiday travel ahead, your brakes are under more stress in the fall. At Wayside Garage, we see an uptick in emergency brake repairs this time of year — many of which could have been avoided with a quick inspection. Our certified technicians will perform a comprehensive brake check, looking at: • Brake pads and rotors • Brake fluid level and condition • Brake lines and hoses • Calipers and hardware And if you’re part of our Wayside Garage Maintenance Plan, your brake inspections are included with your scheduled services. That’s one more reason to stay on track with routine care. ________________________________________ Brakes for Breasts: Repair With a Purpose Every October, we join auto shops nationwide for the Brakes for Breasts campaign. Here’s how it works at Wayside Garage: • You get free brake pads (you only pay for labor and any additional parts if needed). • We donate 10% of the brake job to the Cleveland Clinic Breast Cancer Vaccine Fund. It’s a meaningful way to protect your family on the road while supporting groundbreaking research that could change lives. ________________________________________ Why Choose Wayside Garage for Brake Service? We know you have options when it comes to brake repair in Monterey. So why do so many drivers trust us? • Family-owned and operated since 1946 • ASE-certified technicians who care about doing it right • Honest inspections and clear explanations • Free digital vehicle health reports • A shop built on integrity, hospitality, and professionalism When you bring your vehicle to us, you're not just another ticket — you're part of the Wayside Garage family. ________________________________________ Schedule Your Brake Inspection Today October is the best time to have your brakes checked — and support a great cause while you're at it. Whether you’re noticing a problem or just want peace of mind before the holidays, give us a call or schedule an appointment online. Let's keep your vehicle — and your community — safe this fall.