What could be wrong if the check engine light (MKL) is on?

Reading time 4 Min.

If the Engine control lamp (MKL) lights up in your vehicle, it is a clear signal that your car needs your attention. Although a lit MKL does not always mean an immediate emergency, it should definitely not be ignored. In this article, we will discuss the most common reasons for an active check engine light and how you should best respond to them. Temporary and one-time errors can cause the MKL to light up briefly. Common causes for this are: individual misfires, insufficient tension in the electrical system when starting, dirty contacts or incorrect readings from sensors. In such cases, simply restarting the engine can cause the light to go out. However, if it persists or recurs regularly, a more detailed examination is advisable.

Check engine light (MKL) lights up

All specific componentsThat can cause a permanently glowing MKL include:

• Lambda sensor malfunction: The lambda sensor plays a crucial role in monitoring oxygen levels in the exhaust gases to optimize the fuel-air mixture.
• Damage to one of the ignition coils: Ignition coils are essential for providing the necessary energy for the spark plugs. A defect can lead to loss of engine performance.
• Injection system malfunction: The correct functioning of the injection system is essential for supplying fuel to the engine.
• Damage to the particle filter or catalytic converter: Both components are central to reducing emissions. A defect can lead to increased pollutant emissions.

Another reason for an active MKL can be one incorrect installation of the gas system which may require either readjustment or replacement of faulty components. Diagnosis of an illuminated check engine light should be performed by a qualified mechanic with the proper equipment. Modern diagnostic devices can not only identify the location of the error, but also provide specific error codes that provide information about the cause. Although it is technically possible to clear the error code and turn off the MKL, this is not a long-term solution.

timely diagnosis is important

Such a step does not address the underlying cause and could result in serious engine damage if the vehicle continues to operate without necessary repairs. In summary it can be said that a luminous Engine control lamp an indication that your vehicle needs an inspection. It is important to take such warning signals seriously and act accordingly to avoid expensive repairs or even engine damage. By diagnosing and correcting problems in a timely manner, you can extend the life of your vehicle and ensure that it runs efficiently and in an environmentally friendly manner.

What does the check engine light come on mean?

• If the check engine light (MKL) lights up, it signals a malfunction in the engine or in one of the systems affecting the engine. It is an indication that your vehicle may not be operating correctly and needs to be checked.

5 common causes of the check engine light

1. Defective oxygen sensor (lambda sensor): The lambda sensor measures the oxygen content in the exhaust gases and helps the engine optimize the fuel-air mixture. A defect can lead to inefficient fuel consumption.
2. Problems with the catalytic converter: The catalytic converter reduces pollutant emissions. If it is defective, the vehicle cannot comply with emissions standards, which can ultimately lead to a loss of performance.
3. Loose tank cap: An improperly closed gas cap can interfere with the fuel evaporation system (EVAP), causing emissions problems.
4. Dirty air filter: A dirty air filter restricts airflow to the engine, which can affect performance.
5. Engine misfires: Misfires can be caused by various problems, such as defective spark plugs or ignition coils, and will affect engine performance and fuel economy.

How much longer can you drive?

• If the defect is minor, you should be able to drive the car to a nearby workshop. However, it is advisable to have the vehicle checked as soon as possible to avoid the condition worsening.

Can the MKL go out again on its own?

• Yes, the MKL can expire on its own if it is a temporary error. However, that doesn't mean the problem is fixed. It is always advisable to have the error code read to ensure that no further action is required.

What to do if the MKL is always lit?

• If the MKL stays on or flashes, you should Visit a workshop immediately. A steady glow indicates a serious malfunction that needs to be diagnosed and corrected to avoid major damage.

How expensive can it be?

• The costs for reading an error are usually between 20 and 100 euros, depending on the workshop and the vehicle. However, repair costs may vary depending on the cause of the problem.

What does it mean when the MKL lights up red?

• An red glowing MKL indicates a serious problem, often the engine is overheating or there is no coolant. In this case, you should act immediately to avoid engine damage.

Can the check engine light change color?

• Yes, on some vehicles the MKL can change between yellow and red. Yellow usually signals a warning that something needs to be checked while Red indicates an urgent problem that requires immediate attention.

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