What Is Malfunction Indicator Lamp?


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Malfunction Indicator Lamp or commonly known as the Check Engine Light is an important warning signal in your car's dashboard. This light is designed to alert you about any issues with your car's engine or emission system. Ignoring this warning light may lead to costly repairs in the long run. In this article, we will discuss what the Malfunction Indicator Lamp means, what causes it to light up, how to diagnose the problem, and what to do when it lights up.

What Does Malfunction Indicator Lamp Mean?

The Malfunction Indicator Lamp is a warning light that appears on your dashboard when there is a problem with your car's engine or emission system. When this light turns on, it means that your car's computer system has detected a fault code in one of the sensors or components of your engine or emission system. The fault code is stored in the car's computer system, which can be retrieved by using a diagnostic scanner. The fault code helps the mechanic to diagnose the problem accurately.

What Causes the Malfunction Indicator Lamp to Light Up?

There are several reasons why the Malfunction Indicator Lamp may light up. One of the most common reasons is a loose or damaged gas cap. A loose gas cap can cause the fuel system to lose pressure, which triggers the Malfunction Indicator Lamp. Another reason is a faulty oxygen sensor. The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust system. A faulty oxygen sensor can cause the engine to run poorly and trigger the Malfunction Indicator Lamp.

Other common reasons for the Malfunction Indicator Lamp to light up include a faulty catalytic converter, a malfunctioning mass airflow sensor, a defective ignition coil, a damaged spark plug, and a broken vacuum hose. In some cases, the Malfunction Indicator Lamp may light up due to a software glitch in the car's computer system. It is recommended to have the car checked by a professional mechanic when the Malfunction Indicator Lamp lights up.

How to Diagnose the Problem?

The first step in diagnosing the problem is to retrieve the fault code stored in the car's computer system using a diagnostic scanner. The fault code provides information about which sensor or component is malfunctioning. Once the fault code is retrieved, the mechanic can perform a visual inspection of the engine and emission system to check for any visible signs of damage or wear. The mechanic may also perform a series of tests to check the performance of each component to identify the root cause of the problem.

What to Do When the Malfunction Indicator Lamp Lights Up?

When the Malfunction Indicator Lamp lights up, it is recommended to have the car checked by a professional mechanic as soon as possible. The mechanic can diagnose the problem accurately and provide a solution to fix the problem. Ignoring the warning light may cause the problem to worsen and lead to costly repairs in the long run. In some cases, the car may also fail the emission test if the Malfunction Indicator Lamp is on.

In conclusion, the Malfunction Indicator Lamp is an important warning signal in your car's dashboard that alerts you about any issues with your car's engine or emission system. It is recommended to have the car checked by a professional mechanic when the warning light lights up to diagnose the problem accurately and provide a solution to fix the problem. Ignoring the warning light may lead to costly repairs in the long run.


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