Why Does Engine Light Come On in Car?

The check engine light (CEL) is a warning light that illuminates on your dashboard when your car’s computer detects a problem. There are many reasons why the CEL can come on, and it’s important to know what to do when it happens.

Common Causes of the Check Engine Light

There are many different things that can cause the CEL to come on, but some of the most common include:

* **Loose or faulty gas cap:** This is the most common cause of the CEL. When the gas cap is not properly tightened, it can allow fuel vapors to escape, which can trigger the CEL.
* **Oxygen sensor problems:** The oxygen sensors in your car measure the amount of oxygen in the exhaust gas. If these sensors are not working properly, the CEL can come on.
* **Mass airflow sensor problems:** The mass airflow sensor measures the amount of air that is flowing into the engine. If this sensor is not working properly, the CEL can come on.
* **Spark plug or ignition coil problems:** The spark plugs and ignition coils are responsible for igniting the fuel in the engine. If these components are not working properly, the CEL can come on.
* **Exhaust system problems:** The exhaust system helps to remove harmful gases from the engine. If there is a problem with the exhaust system, such as a leak or a clogged catalytic converter, the CEL can come on.

What to Do When the Check Engine Light Comes On

If the CEL comes on in your car, it’s important to take it to a mechanic as soon as possible. The mechanic will be able to diagnose the problem and make the necessary repairs.

In some cases, the CEL may come on and then go off on its own. This can happen if the problem is temporary, such as a loose gas cap. However, it’s still important to have the car checked out by a mechanic to make sure that there is not a more serious problem.

Ignoring the Check Engine Light

Ignoring the CEL is never a good idea. If you ignore the CEL, it can lead to more serious problems down the road. For example, if you ignore a problem with the oxygen sensor, it can damage the catalytic converter. This can lead to expensive repairs.

In addition, ignoring the CEL can also void your car’s warranty. If you have a problem with your car and the CEL is on, it’s important to take it to a mechanic as soon as possible.

Conclusion

The CEL is a warning light that should not be ignored. If the CEL comes on in your car, it’s important to take it to a mechanic as soon as possible. The mechanic will be able to diagnose the problem and make the necessary repairs.