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Check Engine Light
Check Engine Light

9 Most Common Reasons Why the Check Engine Light Is On

Nothing compares to the frustration you feel when your dashboard displays the check engine light. It is a small, bright warning that there might be a problem with your vehicle.  

For many of us in Glynde, South Australia, a car is more than just a convenience! It is a need. Let us explore the possible causes of this light and what it might indicate about your car.  

What Are the Dangers of Ignoring the Check Engine Light?

Consider the check engine light on your dashboard as your car’s alarm for distress. This light flickers as a crucial alert, not just a friendly reminder. This little light could be alerting you to a minor issue that can be fixed quickly, like a loose gas cap, or it could be a warning sign for a major problem that, if left unchecked, could damage your car and possibly endanger your safety.  

Not only is it important to take care of your car, but responding quickly to this signal can also help you stay safe and prevent more serious and costly issues in the future. It is therefore best to take immediate action by probing the issue as soon as you notice that light. By identifying problems early on, this strategy can help control your car maintenance expenses in addition to keeping you driving safely. 

Common Causes for the Check Engine Light:

Oxygen Sensor Failure:

Because it measures the amount of unburned oxygen in the exhaust, the oxygen sensor is essential to the operation of your car. This measurement aids in fuel mixture control by the computer in your vehicle. Inefficient fuel use from a damaged sensor could result in your car burning more fuel than is necessary and producing more emissions. 

Loose or Faulty Gas Cap:

Due to its ability to modify fuel system pressure and discharge fuel vapours into the atmosphere, a seemingly insignificant issue like a loose gas cap may result in the check engine light turning on. A quick fix for this issue is often to make sure the cap is tight and in good condition. 

Catalytic Converter Failure:

The catalytic converter is necessary to cut down on emissions from the exhaust. If it malfunctions, your car will not only produce more pollutants, but it might also operate less well and eventually cause engine damage that would require a costly repair. 

Spark Plug/Ignition Coil Issues:

Ignition coils give spark plugs the electricity they need to ignite the fuel in your engine. Issues with any one of the components may result in misfires, low fuel economy, decreased power, and an increase in emissions. 

Bad Spark Plug Wires:

Faulty spark plug wires can cause engine misfires, much like problems with coils and plugs. The spark plugs receive the electrical current from the coils through these wires. A worn-out engine will not let the engine run smoothly. 

Mass Airflow Sensor Failure:

This sensor calculates how much fuel the engine needs to run efficiently by measuring the amount of air that enters it. Its failure could cause the air-fuel mixture to become unbalanced, which would impact the engine’s efficiency and emissions. 

Exhaust Gas Recirculation Valve Issue:

This valve returns some of the engine’s exhaust to the engine cylinders, which lowers nitrogen oxide emissions. Its malfunction could result in higher emissions and problems with the engine’s performance. 

Aftermarket Alarm Problems:

Sometimes, improper integration of aftermarket alarms into the vehicle’s electrical system results in unexpected electrical issues, such as the check engine light coming on. 

Old Battery:

An outdated or failing battery can not only make it more difficult for an automobile to start, but it can also negatively affect the electrical system’s overall voltage stability, which can set off the check engine light. 

How Can We at Kochhar Motors Help?

There is no reason to panic if the check engine light on your dashboard appears suddenly. At Kochhar Motors, we have everything we need to help you.  

With the most up-to-date diagnostic equipment at their disposal, our skilled mechanics can identify the problem’s core cause with promptness and accuracy. We try to explain the issue in simple, understandable terms since we understand how annoying car problems can be.  

To resolve the problem and get your car fixed and back on the road as soon as possible, our team will provide you with clear, practical solutions. You can trust that your car is in good hands with us because we put your safety and satisfaction first. We aim to quickly and effectively handle any issues so you can drive with assurance and comfort. 


Even though the check engine light might be scary, it is just your car trying to tell you something. This alert will help you take care of problems before they get out of hand. To keep your car in excellent condition and keep you safe when driving, regular maintenance is the best course of action. 


Q1. What should I do immediately if my check engine light comes on?

Ans. If the light persists, it is advisable to check simple problems like your gas cap before taking your car to a mechanic for a thorough diagnostic.

Q2. Is it safe to drive with the check engine light on?

Ans. Even though some problems might only be small, it is usually best to get your car checked out right away to minimize any risks.

Q3. Can the check engine light reset itself?

Ans. Yes, the light can turn off if the problem is simple and fixes itself, such as replacing a loose gas cap. Still, you need to have a checkup to make sure everything is in working condition.

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