10 Common Reasons Your Check Engine Light is On

Your car’s check engine light, also known as the malfunction indicator lamp, serves as an early warning system for potential engine troubles. It’s like your car’s way of telling you something isn’t quite right. When it suddenly illuminates on your dashboard, it can easily trigger a wave of anxiety and a flurry of questions. Is it a minor issue? Or is it something serious, like engine problems, that requires immediate attention? It’s not always easy to tell.

In this blog post, we’ll explore 10 of the most common reasons why your check engine light might be on, helping you understand the possible underlying issues and what your next steps should be. Buckle up, and let’s dive into the world of automotive diagnostics and repair.

Call 317-475-1846 When You Need Check Engine Light Diagnostics in Indianapolis Indiana
Call 317-475-1846 When You Need Check Engine Light Diagnostics in Indianapolis Indiana

Top 10 Reasons Why a Check Engine Light Comes On

1. Loose Gas Cap

It might seem like a simple and almost comical reason, but a loose gas cap can actually cause your check engine light to come on. Your car’s fuel system is designed to be airtight, and when the gas cap is not properly sealed, it can lead to an incorrect fuel-to-air ratio that triggers the light. If this is the case, simply tighten or replace your gas cap and see if the light goes off.

2. Faulty Oxygen Sensor

Your car’s oxygen sensor measures the amount of unburned oxygen in your exhaust system and helps regulate the fuel-to-oxygen ratio. A faulty sensor can cause your check engine light to come on and reduce your gas mileage, leading to a higher level of emissions. It’s important to have this sensor replaced promptly to avoid further engine damage and reduce your impact on the environment.

3. Failing Catalytic Converter

Catalytic converters are responsible for reducing harmful emissions from your car’s exhaust fumes. When it fails, not only can it cause your check engine light to come on, but it can also lead to decreased engine performance and increased pollution. If you notice a decrease in acceleration or an unusual smell from your exhaust, the catalytic converter may be the culprit.

4. Malfunctioning Mass Airflow Sensor

The mass airflow sensor measures the amount of air entering your car’s engine and helps regulate fuel flow. When this sensor malfunctions, it can cause a variety of issues, including decreased gas mileage and engine performance. Ignoring the problem can lead to more severe engine damage, so be sure to address any issues with your mass airflow sensor as soon as possible.

5. Faulty Spark Plugs or Wires

Spark plugs and wires are essential components in your car’s ignition system. When they fail, your car may have trouble starting, and the check engine light can come on as a result. Regularly checking and replacing these parts can prevent further damage and keep your car running smoothly.

6. Worn-Out Timing Belt

The timing belt is responsible for synchronizing the rotation of the crankshaft and camshaft in your car’s engine. When it becomes worn or damaged, your engine may misfire, leading to a check engine light warning. If left defective, a broken timing belt can cause significant and costly damage to your engine.

7. Faulty Ignition Coil

The ignition coil is responsible for supplying electricity to your car’s spark plugs, allowing them to ignite the fuel in the engine. When it fails, your car may experience issues with starting or acceleration, and the check engine light can come on as a result. Replacing a faulty ignition coil is relatively simple and can prevent further problems down the road.

8. Loose or Damaged Exhaust Pipe

If you hear a hissing noise coming from your exhaust system, it could be a sign of a loose or damaged exhaust pipe. A damaged pipe can cause your check engine light to come on and also lead to increased emissions and decreased fuel efficiency. It’s essential to have any issues with your exhaust system addressed promptly to avoid further damage and costly repairs.

9. Low Fluid Levels

If your car’s fluid levels, such as oil, transmission fluid, or coolant, are running low, it can cause your engine to function improperly. This can trigger your check engine light and potentially lead to more severe engine damage if not addressed promptly. Regularly checking and topping off fluid levels is an essential part of car maintenance and can prevent costly repairs in the future.

10. Electrical Issues

Modern cars are heavily reliant on complex electrical systems to function correctly. If there’s a problem with any of these systems, such as the battery or alternator, it can trigger your check engine light warning. Have an expert perform a diagnostic test using a check engine light reader to pinpoint the exact issue and prevent potential breakdowns on the road.

Conclusion

While seeing your check engine light come on can be a cause for concern, it’s important to remain calm and address the issue promptly. Ignoring warning signs can lead to more severe and costly engine damage in the future. By understanding these 10 common reasons why your check engine light is on, you can be better equipped to identify and resolve any potential issues with your car. Remember, regular maintenance and timely repairs are crucial for keeping your car running smoothly and efficiently.

Is your check engine light flashing or illuminated? If so, you need immediate automotive diagnostics at an affordable price. Contact Northeast Auto Service at 317-475-1846 for professional automotive service and repair in Indianapolis, Indiana. Request a free estimate, or schedule service, today.

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Do I Have to Repair a Check Engine Light?

When that check engine light comes on, the panic starts to set in. “How much is this going to cost me?” is the only thought that runs through your head until you take your vehicle to a mechanic for an inspection. But while you wait for the diagnosis, there is no need to worry prematurely; not all check engine light warnings are serious. In fact, some are so minor, car owners ask themselves whether or not it’s even worth fixing. On the other hand, some are so easy to fix, you can manage it on your own, and at no cost.

If your check engine light is on, continue reading to learn why it might have illuminated and what your options are for repair.

Indianapolis Check Engine Light Repair
Indianapolis Check Engine Light Repair 317-475-1846

Check Engine Light Warnings

A check engine light is also referred to as a malfunctioning indicator lamp (MIL). They are designed to detect mechanical and electrical issues within a vehicle, and then illuminate upon detection. Once your check engine light comes on, your first step is to get a diagnostic reading. You can purchase a check engine light code reader online or at your local auto supply store, however, it is better to have it done by a trained mechanic who can help you understand the issue and your options for repair.

Minor Automotive Issues

Some of the most common causes for a check engine light to illuminate are somewhat minor problems. For example, a top cause is a loose or open gas cap. Simply forgetting to close your gas cap can cause your check engine light to illuminate, so be sure to always check this first before heading to your local auto shop. Another common cause for a check engine light to come on is low tire pressure. Not all vehicle’s are designed with a malfunctioning indicator lamp that will detect this issue, but most newer models do. Simply tend to your tire as needed, and the check engine light will turn off.

Moderate to Major Automotive Issues

The check engine light is also designed to detect more serious issues with your vehicle. If the minor causes are not applicable to your situation, it could be a moderate to major automotive issue. Some of the most common moderate to major issues detected by a malfunctioning indicator lamp include:

Your vehicle needs a new oxygen (o2) sensor.

Your vehicle needs a new mass airflow sensor (MAF).

Your vehicle needs new spark plugs or plug wires.

The catalytic converter is damaged or defective.

To Repair or Not to Repair

It is important to talk to your trusted Indianapolis mechanic for advice on car care and automotive repair. If your check engine light came on due to a minor issue, you won’t need auto repair service. However, if it came on due to something more serious, the issue must be repaired or corrected in order to safety and efficiency of your vehicle. Even if you feel that your car is operating just fine, you should still have it inspected, as some problems can start small and worsen, overtime.

Need an Auto Mechanic?

Call Northeast Auto Service at 317-475-1846 for professional Indianapolis check engine light services you can trust. Our ASE certified car mechanics provide a wide range of automotive services for all make and model vehicles, foreign and domestic. Schedule a free inspection and estimate, anytime. Don’t forget to ask us about our auto repair coupons and discounts!